مجلات 18,341 دوريات أكاديمية 12,317 Trade Publications 11,330 أخبار 6,171 موارد غير مطبوعة 1,308 تقارير 1,165 القواعد الإلكترونية: من أ الى ي 492 رسائل جامعية 318 مراجعات 296 مواد مؤتمر 118 كتب 108 كتب الكترونية 100 الفيديوهات 92 سمعي 22 ريسرش ستارترز 10 خرائط 9

airline industry 11,700 commercial aeronautics 8,586 aviation 4,492 airports 4,040 السياحة 3,047 travel 2,564 air travelers 2,554 aeronautics 2,386 الأعمال 2,142 airplanes 2,095 american airlines 1,909 international air travel 1,884 airline rates 1,883 وسائل النقل 1,704 business.industry 1,603 airlines 1,533 united states. federal aviation administration 1,498 covid-19 pandemic 1,410 commercial aeronautics passenger traffic 1,375 business travel 1,335 air transport 1,226 air travel safety 1,224 travelers 1,190 transportation industry 1,113 الطب 1,091 international airports 1,084 travel agents 1,024 covid-19 1,014 air traffic control 1,002 voyages & travels 987 الاقتصاد 943 pan american world airways (pan am) 936 clipper flights 921 delta air lines inc. 884 aircraft accidents 875 البشر 865 flight 825 airport 809 السياسة الحكومية 800 passengers 784 american airlines inc. 765 united airlines inc. 762 air freight 734 carter 708 british airways plc 701 التسويق 699 amon giles 690 sr 690 flight delays & cancellations (airlines) 649 boeing co. 645

 مؤسسة بنتون للإعلام 4,501 northstar travel media llc 4,179 bloomberg, l.p. 3,658 dow jones & company inc 3,164 dvv media international 1,863 نيويورك تايمز 1,669 إلزيفير 1,193 baxter publications inc. 749 تايلور وفرانسيس المحدودة 724  وايلي-بلاكويل 710 elsevier bv 465 مؤسسة كرين للاتصالات (ولاية ميتشغان) 416 سبرينغر ناتشر 364 arizent 345 future publishing ltd. 303 indiana university, bloomington. university archives 246 indiana university. digital library program 246  السعي وسائل الإعلام التجارية 225 معهد النشر الرقمي متعدد التخصصات (MDPI) 196 إلزيفير 124 alexander turnbull library 93 وايلي 85 إيه سكولارشيب، جامعة كاليفورنيا 78 روتليدج 40 bmc 34 georgia institute of technology 24  مطبعة جامعة أكسفورد 24 frontiers media s.a. 21 virginia tech 14 prt 8  بالجريف ماكميلان 4 the university of bergen 4 pergamon press 3 university of plymouth 3 konsorcjum baztech 2 marshall cavendish international 2 associacao brasileira de hematologia e hemoterapia e terapia celular 1 hirosaki university press. 1 japanese association for acute medicine 1 japanese society of national medical services 1 japanese society of neurological therapeutics 1 marshall cavendish international [asia] pte ltd 1 morgan james publishing 1 the japanese society on thrombosis and hemostasis 1 the medical association of nippon medical school 1 u.s. dept. of transportation, office of general counsel, aviation consumer protection division 1 uliege - universite de liege 1 university of georgia press 1 一般社団法人 国立医療学会 1 一般社団法人 日本血栓止血学会 1

الإنجليزية 56,842 unknown 4,733 غير محدد 2,359 الألمانية 138 الفرنسية 95 الأسبانية؛ القشتالية 46 البرتغالية 39 الصينية 28 التركية 28 الأسبانية 25 السويدية 25 البولندية 13 الأوكرانية 13 المجرية 12 التشيكية 11 الكورية 11 الروسية 11 العربية 9 الإيطالية 9 اليابانية 8 لغات متعددة 6 النرويجية 6 السلوفاكية 6 الدنماركية 5 en_us 5 اليونانية، الحديثة (1453-) 5 البوسنية 4 الكرواتية 4 الفنلندية 4 الإنجليزية، القديمة (450-1100) 3 الليتوانية 3 الرومانية 3 السلوفينية 3 الصربية 2 af_za 1 الأفريكانية 1 الهولندية ؛ الفلمنكية 1 الإنجليزية 1 الآيسلندية 1 الإندونيسية 1 اللاتينية 1

bloomberg.com 2,924 travel weekly 2,640  أسبوع الطيران وتكنولوجيا الفضاء 2,502 مجلة وول ستريت - الطبعة الشرقية 2,064 travel trade gazette uk & ireland 1,804 travel daily 1,639 نيويورك تايمز 1,631 air transport world 1,061 travel agent 773 business travel news 698 travel courier 438 journal of air transport management 298 kiplinger personal finance 216 maclean's 214 transportation science 207 bond buyer 153 journal of transport geography 140 journal of travel medicine 136 memoria digital de catalunya 126 journal of sustainable tourism 106 otago daily times 104 journal of travel research 87 defense transportation journal 40 tourism management 38  الأمريكي العلمي 31 transport reviews 23 العلوم 15 bmc infectious diseases 13 emerging infectious diseases 12 الاستدامة 12 transportation research interdisciplinary perspectives 11 salem press encyclopedia 8  بي إم سي الصحة العامة 7 lakartidningen 6 north carolina digital heritage center 6 plos neglected tropical diseases 6 ugeskrift for laeger 6 library of congress prints and photographs division 5 revista brasileira de hematologia e hemoterapia 2 tobacco control 2 collision course : ronald reagan, the air traffic controllers, and the strike that changed america 1 covid-19 in asia : law and policy contexts 1 crs reports (library of congress. congressional research service) 1 from above : war, violence, and verticality 1 guests of god : pilgrimage and politics in the islamic world 1 japanese journal of national medical services 1 japanese journal of thrombosis and hemostasis 1 journal of nippon medical school 1 logistyka 1 mcqs in travel medicine 1

فهرس مكمل 20,546 Business Source Index 19,483 Academic Search Index 9,469 BASE 6,906 فهرس تكميلي 3,487 OpenAIRE 2,898 دوريات JSTOR 642 OAIster 487 Finance Source 410 فهرس نيوزيلندا 189 DigitalNZ 115 دليل الدوريات المفتوحة 100 فهرس الكتاب الإلكتروني 87 أوربيانا 74 Networked Digital Library of Theses & Dissertations 67 SwePub 43 OpenDissertations 23 المنحة الإلكترونية 18 RCAAP 18 Government Publishing Office Catalog 12 إيمرالد انسايت 11 ريسرش ستارترز 10 SveMed+ 9 منحة أكسفورد أون لاين 8 ORBi 8 British Library EThOS 6 NORA (أرشيف البحث المفتوحة النرويجي) 6 J-STAGE 6 eBook Business Collection (EBSCOhost) 4 SciTech Connect 2 مستودع الموارد حرة الوصول في العلوم الاجتماعية 2 BazTech 2 Biodiversity Heritage Library 1 مكتبة OAPEN 1 ClinicalTrials.gov 1 Digital Library of the Caribbean 1 SciELO 1

الولايات المتحدة الأمريكية 9,002 المملكة المتحدة 1,862 أوروبا 1,131 الصين 1,014 أستراليا 653  كندا 627 england 477 california 280 new zealand 264 أفريقيا 214

University Of Miami: Digital Collections 359 Indiana University Libraries Digital Projects & Services 246 Mdc - Memoria Digital De Cataluny 126 Territory Stories (Northern Territory Government, Australia) 92 Directory Of Open Access Journals: Doaj Articles 87 Cdc Stacks (Centers For Disease Control And Prevention) 68 The World Bank: Open Knowledge Repository (Okr) 64 University Of North Texas: Unt Digital Library 64 New Mexico Digital Collections (The University Of New Mexico - Unm) 58 The Portal To Texas History (University Of North Texas) 53 Hathi Trust Digital Library 46 Georgia State University Library Digital Collections 45 Datacite Metadata Store (German National Library Of Science And Technology) 39 Citeseerx 36 Washington State University: Wsu Libraries Digital Collections 33 Delaware Heritage Collection 32 Sfu Digitized Collections (Simon Fraser University) 22 The University Of Utah: J. Willard Marriott Digital Library 22 Indiana Historical Society: Digital Image Library 21 Smithsonian Institution: Digital Repository 18 University Of Florida: Digital Library Center 16 Dspace@Mit (Massachusetts Institute Of Technology) 15 The University Of The West Indies, St. Augustine: Uwispace 15 Zenodo 15 Eth Zurich Research Collection 14 University Of California: Escholarship 14 Archive Ouverte Hal (Hyper Article En Ligne, Ccsd - Centre Pour La Communication Scientifique Directe) 13 Theseus.Fi (Open Repository Of The Universities Of Applied Sciences / Ammattikorkeakoulujen Julkaisuarkisto) 13 University Of Wisconsin, Milwaukee: Uwm Libraries Digital Collections 13 Georgia Institute Of Technology: Smartech - Scholarly Materials And Research At Georgia Tech 12 Lund University Publications (Lup) 12 Smithsonian Institution: Figshare 12 Mdpi Open Access Publishing 11 The University Of Queensland: Uq Espace 11 Idaho State Historical Society Digital Collections 10 Utsa Digital Collections (The University Of Texas At San Antonio) 10 Defense Technical Information Center: Dtic Technical Reports Database 9 Leiden Repository (Leiden University) 9 University Of Michigan: Digital Library Production Service (Dlps) 9 Embry-Riddle Aeronautical University: Erau Scholarly Commons 8 Pennstate: Digital Collections 8 University Of Alabama Libraries: Acumen 8 University Of Liege: Orbi (Open Repository And Bibliography) 8 University Of Pretoria: Upspace 8 Monash University, Institute Of Transport Studies: World Transit Research (Wtr) 7 University Of Malta: Oar@Um / L-Universita Ta' Malta 7 University Of St. Gallen: Research Platform Alexandria 7 Aalto University Publication Archive (Aaltodoc) / Aalto-Yliopiston Julkaisuarkistoa 6 Aix-Marseille Universite: Hal 6 Chalmers Research (Chalmers University Of Technology, Gothemborg / Chalmers Tekniska Hogskola) 6 Diposit Digital De La Universitat De Barcelona 6 Lincoln University (New Zealand): Lincoln U Research Archive 6 Loughborough University: Figshare 6 National Cheng Kung University: Ncku Institutional Repository / 國立成功大學機構典藏 6 Portland Public Library: Digital Commons 6 University College London: Ucl Discovery 6 Who (World Health Organization): Institutional Repository For Information Sharing (Iris) 6 Delft University Of Technology: Institutional Repository 5 Houston Academy Of Medicine-Texas Medical Center (Ham-Tmc): Digitalcommons@The Texas Medical Center 5 Lund University Publications Student Papers (Lup-Sp) 5 National Library Of Australia: Digital Collections 5 National Technical University Of Athens (Ntua): Dspace 5 Universitat Politecnica De Catalunya, Barcelonatech: Upcommons - Global Access To Upc Knowledge 5 University Of Technology Sydney: Opus - Open Publications Of Uts Scholars 5 University Of The Arts London: Ual Research Online 5 University Of Washington, Seattle: Digital Collections 5 University Of Western Sydney (Uws): Research Direct 5 Biomed Central 4 Columbia University: Academic Commons 4 Cranfield University: Collection Of E-Research - Ceres 4 Dergipark Akademik (E-Journals) 4 Di-Fusion : Depot Institutionnel De L'universite Libre De Bruxelles (Ulb) 4 Econstor (German National Library Of Economics, Zbw) 4 Georgia Southern University: Digital Commons@Georgia Southern 4 Ghent University Academic Bibliography 4 North Dakota State University (Ndsu): Digital Horizons 4 Repositorio Da Universidade Nova De Lisboa (Unl) 4 Southern Cross University: Epublications@Scu 4 The University Of Texas At Austin: Texas Scholarworks 4 The University Of Toledo (Ut): Digital Repository 4 Universite De Lausanne (Unil): Serval - Serveur Academique Lausannois 4 University Of Economics, Prague (Vse): Science And Research / Vysoka Skola Ekonomicka V Praze 4 University Of Massachusetts: Scholarworks@Umass Amherst 4 Vtechworks (Virginiatech) 4 Aalborg University (Aau): Publications / Aalborg Universitet: Publikationer 3 Aisberg - Archivio Istituzionale Dell'universita Di Bergamo 3 Archive Ouverte De L'universite Rennes (Hal) 3 Arizona Memory Project (Arizona State Library, Archives And Public Records) 3 Au Digital Research Archive (American University) 3 Australian National University: Anu Digital Collections 3 Ball State University: Cardinal Scholar 3 Cape Peninsula University Of Technology (Cput): Cape Peninsula University Of Technology (Cput) Institutional Repository 3 Central Queensland University: Acquire 3 Cogitatio Press (E-Journals) 3 Czech Technical University In Prague: Digital Library / Ceske Vysoke Uceni Technicke V Praze: Digitalni Knihovna Cvut 3 Dumas (Depot Universitaire De Memoires Apres Soutenance) 3 Graz University (Ugr): Unipub 3 Helsingfors Universitet: Helda - Helsingin Yliopiston Digitaalinen Arkisto 3 Inserm: Hal (Institut National De La Sante Et De La Recherche Medicale) 3 Institut National Des Sciences De L'univers: Hal-Insu 3 Institutional Knowledge (Ink) At Singapore Management University 3 Iris Universita Degli Studi Di Bologna (Cris - Current Research Information System) 3 Maastricht University Research Publications 3 Massey University: Massey Research Online 3 Memorial University Of Newfoundland: Digital Archives Initiative (Dai) 3 National University Of Singapore: Scholarbank@Nus 3 Nova: The University Of Newcastle Research Online (Australia) 3 Pearl (Plymouth Electronic Archiv & Researchlibrary, Plymouth University) 3 Pepperdine University: Pepperdine Digital Collections 3 Qatar University: Qu Institutional Repository 3 Research Data Australia (Australian National Data Service - Ands) 3 Robert Koch Institute: Publications 3 The Online Books Page (Penn Libraries, University Of Pennsylvania) 3 Universite De Nantes: Hal-Univ-Nantes 3 Universite De Versailles Saint-Quentin-En-Yvelines: Hal-Uvsq 3 University Of British Columbia: Circle - Ubc's Information Repository 3 University Of Groningen Research Database 3 University Of Illinois At Urbana-Champaign: Ideals (Illinois Digital Environment For Access To Learning And Scholarship) 3 University Of Nairobi Digital Repository 3 University Of South Africa: Unisa Institutional Repository 3 University Of Toronto: Research Repository T-Space 3 University Of Westminster: Westminsterresearch 3 University Of Wisconsin: Digital Collections 3 Washington Rural Heritage (Washington State Library) 3 Washington State Library: Digital Collections And Resources 3 Western Kentucky University (Wku): Topscholar 3 Anglia Ruskin University: Figshare 2 Apollo - University Of Cambridge Repository 2 Arca (Bc's Digital Treasures) 2 Biodiversity Heritage Library (Bhl) 2 Claremont Colleges: Scholarship@Claremont 2 Cleveland State University: Engagedscholarship@Csu 2 Curtin University: Espace 2 Dialnet - Portada De Revistas (Universidad De La Rioja) 2 Ecole Polytechnique, Universite Paris-Saclay: Hal 2 Ege University Institutional Repository 2 Erknutd - Electronic Repository Kyiv National University Of Technologies And Design 2 Hal-Cea (Commissariat A L'energie Atomique Et Aux Energies Alternatives) 2 Harvard University: Dash - Digital Access To Scholarship At Harvard 2 Hrcak - Portal Of Scientific Journals Of Croatia / Portal Znanstvenih Casopisa Republike Hrvatske 2 Iima Institutional Repository (Indian Institute Of Management) 2 Imperial College London: Spiral 2 Indiana University - Purdue University Indianapolis: Iupui Scholar Works 2 Institut National De La Recherche Agronomique: Prodinra 2 Jyx - Jyvaskyla University Digital Archive / Jyvaskylan Yliopiston Julkaisuarkisto 2 King's College, London: Research Portal 2 Koc University Suna Kirac Library' Digital Collections 2 Le Mans Universite: Archives Ouvertes (Hal) 2 Linkoping University Electronic Press (Liu E-Press) 2 Mcgill University: Escholarship@Mcgill 2 Mid Sweden University: Publications (Diva) 2 Missouri University Of Science And Technology (Missouri S&T): Scholars' Mine 2 Museum National D'histoire Naturelle (Mnhm): Hal 2 Normandie Universite: Hal 2 Openedition 2 Pepperdine University: Pepperdine Digital Commons 2 Queen's University, Ontario: Qspace 2 Queensland University Of Technology: Qut Eprints 2 Royal Inst. Of Technology, Stockholm (Kth): Publication Database Diva 2 Sapienza Universita Di Roma: Cineca Iris 2 South African Medical Journal (Samj) 2 Ssoar - Social Science Open Access Repository 2 Stellenbosch University: Sunscholar Research Repository 2 Stockholm University: Publications (Diva) 2 Technical University Of Lisbon: Utl Repository / Universidade Tecnica De Lisboa 2 Texas A&M University Digital Repository 2 The Hong Kong University Of Science And Technology: Hkust Institutional Repository 2 The State Library Of Massachusetts: Electronic Repository 2 The State University Of New York: Suny Digital Repository 2 The University Of Akron: Archival Services Digital Collections 2 The University Of Manchester: Research Explorer - Publications 2 The University Of Milan: Archivio Istituzionale Della Ricerca (Air) 2 The University Of Sydney: Sydney Escholarship Repository 2 Theses Canada / Theses Canada (Library And Archives Canada) 2 Umea University: Publications (Diva) 2 Universidad Eafit, Medellin: Repositorio Institucional 2 Universidade Da Beira Interior: Ubi Thesis - Conhecimento Online 2 Universidade Federal Do Rio Grande Do Sul (Ufrgs): Lume 2 Universidade Tecnologica Federal Do Parana (Utfpr): Repositorio Institucional (Riut) 2 Universita Cattolica Del Sacro Cuore: Publicatt 2 Universita Degli Studi Di Bari Aldo Moro: Cineca Iris 2 Universitat Autonoma De Barcelona: Diposit Digital De Documents De La Uab 2 Universitat Oberta De Catalunya (Uoc), Barcelona: Institutional Repository 2 Universitat Politecnica De Catalunya (Upc): Tesis Doctorals En Xarxa (Tdx) / Theses And Dissertations Online 2 Universite De Lyon: Hal 2 Universite Toulouse Iii - Paul Sabatier: Hal-Ups 2 Universitet I Oslo: Digitale Utgivelser Ved Uio (Duo) 2 University Of Alberta: Era - Education And Research Archive 2 University Of Bedfordshire Repository 2 University Of Bergen: Bergen Open Research Archive (Bora-Uib) 2 University Of Central Florida (Ucf): Stars (Showcase Of Text, Archives, Research & Scholarship) 2 University Of Montana: Scholarworks 2 University Of North Carolina: Unc Digital Collections 2 University Of South Florida (Usf), Tampa: Scholar Commons 2 University Of South Florida St. Petersburg: Digital Usfsp 2 University Of Tennessee, Knoxville: Scholarly Communication Services 2 Unsw Sydney (The University Of New South Wales): Unsworks 2 Usma Digital Commons (United States Military Academy, West Point) 2 Victoria University Melbourne: Vu Eprint Repository 2 Wake Forest University: Wakespace Digital Archive 2 Wichita State University: Soar (Shocker Open Access Repository) 2 Zhaw Digitalcollection (Repository Of The Zurich University Of Applied Sciences) 2 Aarhus University: Ojs At The State And University Library 1 American University In Cairo: Rare Books And Special Collections Digital Library 1 Architexturez South Asia 1 Archive De L'observatoire De Paris (Hal) 1 Arizona State University: Asu Digital Repository 1 Association For Information Systems Research: Ais Electronic Library (Aisel) 1 Auburn University Digital Library 1 Ball State University: Digital Media Repository 1 Bangladesh Journals Online (Banglajol) 1 Bates College: Scarab (Scholarly Communication And Research At Bates) 1 Bioemco: Hal (Biogeochimie Et Ecologie Des Milieux Continentaux) 1 Bioline International (Reference Center On Environmental Information, Brazil) 1 Boston College: Escholarship@Bc 1 Brigham Young University (Byu): Scholarsarchive 1 Brno University Of Technology (Vut): Digital Library / Vysoke Uceni Technicke V Brne: Digitalni Knihovne 1 Brock University Digital Repository 1 California State University, San Bernardino Research: Csusb Scholarworks 1 Camoes - Repositorio Institucional Da Universidade Autonoma De Lisboa 1 Carolina Digital Repository (Unc - University Of North Carolina) 1 Center For Jewish History: Digital Collections 1 Ciencia Unisalle (Universidad De La Salle, Bogota) 1 Colecciones Digitales - Biblioteca Virtual Del Banco De La Republica 1 Collective Dynamics (E-Journal) 1 Cornell University: Ecommons@Cornell 1 Coventry University: Curve/Open 1 Croatian Digital Theses Repository (National And University Library In Zagreb) 1 Digital Commons @ East Tennessee State University 1 Digital Commons @ Tru Library (Thompson Rivers University) 1 Digital Commons At St. Mary's University, San Antonio 1 Digital Repository Of The University Of Hawaii At Manoa 1 Digitalcommons@Um Law (University Of Maryland, School Of Law) 1 Dspace Vsb-Tuo (Vysoka Skola Banska - Technicka Univerzita Ostrava / Technical University Of Ostrava) 1 Eastern Kentucky University: Encompass 1 Eastern Mediterranean University Institutional Repository (Emu I-Rep), Famagusta 1 Ecole Des Ponts Paristech: Hal 1 Electronic National Technical University "Kharkiv Polytechnic Institute" Institutional Repository (Entukhpiir) / Електронному Репозитаріі Національного Технічного Університету "Харківськии Політехнічнии Інститут" 1 Enac: Hal (Ecole Nationale De L'aviation Civile) 1 Eoneu - Electronic Odessa National Economic University / Одеськии Національнии Економічнии Університет 1 Erudit.Org (Universite Montreal) 1 European University Institute, Italy: Cadmus (Eui Research Repository) 1 Fairleigh Dickinson University Digital Archives 1 Federation Of Finnish Learned Societies: Scientific Journals Online 1 Florida International University: Digital Commons@Fiu 1 Fordatis - Research Data Repository Of Fraunhofer-Gesellschaft 1 Fordham Law School Institutional Repository 1 Fundacao Getulio Vargas: Dspace@Fgv. 1 George Mason University: Mars 1 Griffinshare @ Fontbonne University 1 Griffith University: Griffith Research Online 1 Hal - Universite De La Rochelle 1 Hal Lyon 1 (University Claude Bernard Lyon 1) 1 Harvard Dataverse Network 1 Historias Fingidas (E-Journal, Universita Di Verona, Dipartimento Di Lingue E Letterature Straniere) 1 Hofstra Northwell Academic Works (Hofstra Northwell School Of Medicine) 1 Ibn Haldun University Institutional Repository 1 Iris Unipv (Universita Degli Studi Di Pavia) 1 Johns Hopkins University, Baltimore: Jscholarship 1 Jonkoping Univ.: Publications 1 Journal Of International Trade, Logistics And Law (Jital - Istanbul Commerce University) 1 Journal Of Islamabad Medical & Dental College 1 Kansas State University: K-State Research Exchange (K-Rex) 1 Karlstad University: Publications 1 Kenyatta University Repository 1 Lacris - University Of Lapland Current Research System 1 Laei Vl (Lithuanian Institute Of Agrarian Economics Virtual Library) / Laei Vb (Lietuvos Agrarines Ekonomikos Institutasvirtualia Biblioteka) 1 Lebanese American University Repository (Laur) 1 Lenus - Irish Health Publications Archive (Hse - Health Service Executive) 1 Linnaeus University Kalmar Vaxjo: Publications 1 Lower Silesian Digital Library 1 Lsrc Vl (Lithuanian Social Research Centre Virtual Library) / Lstc Vb (Lietuvos Socialiniu Tyrimu Centras Virtualia Biblioteka) 1 Lynchburgcollege: Digital Showcase 1 Malmo University Electronic Publishing (Muep) 1 Maltepe University Institutional Repository (Dspace@Maltepe) 1 Medcrave 1 Meteo-France: Hal 1 National Archive Of Phd Theses (National Documentation Centre Greece) 1 National Chiao Tung University: Nctu Institutional Repository / 國立交通大學機構典藏 1 National Health Institute, Portugal: Repositorio Cientifico 1 National Inst. For Public Health And The Environment, Netherlands (Rivm): Webbased Archive Of Rivm Publications (Warp) 1 Natural Resources Institute Finland: Jukuri / Luonnonvarakeskuksen (Luke) 1 New York Heritage Digital Collections 1 North Dakota State University (Ndsu) Digital Repository 1 Nottingham Research Data Management Repository (University Of Nottingham) 1 Ocad University Open Research Repository (Ontario College Of Art And Design) 1 Ohiolink: Electronic Theses And Dissertations Center 1 Open Access Journals At Aalborg University 1 Open Archive Norwegian University Of Life Sciences (Nmbu) 1 Oregon Digital (University Of Oregon / Oregon State University) 1 Otterbein University: Digital Commons @ Otterbein 1 Pensoft Publishers 1 Persee: Portail De Revues Scientifiques En Sciences Humaines Et Sociales 1 Pohang University Of Science And Technology (Postech): Open Access System For Information Sharing (Oasis) 1 Pontificia Universidad Javeriana Cali: Sistema De Gestion Revistas 1 Portail Hal De L'universite Lumiere Lyon 2 1 Portal De Periodicos Da Pucpr (Pontificia Universidade Catolica Do Parana) 1 Project Gutenberg (Pg) 1 Providence St. Joseph Health Digital Commons 1 Publikationsdatenbank Der Fraunhofer-Gesellschaft 1