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1دورية أكاديمية
المؤلفون: Canning, Patrick N., Vroomen, Harry
المصدر: American Journal of Agricultural Economics, 1996 Nov 01. 78(4), 1026-1033.
الوصول الحر: https://www.jstor.org/stable/1243858Test
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2دورية أكاديميةNitrogen-Land Substitution in Corn Production: A Reconciliation of Aggregate and Firm-Level Evidence
المؤلفون: Hertel, Thomas W., Stiegert, Kyle, Vroomen, Harry
المصدر: American Journal of Agricultural Economics, 1996 Feb 01. 78(1), 30-40.
الوصول الحر: https://www.jstor.org/stable/1243776Test
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3دورية أكاديمية
المؤلفون: Vroomen, Harry
العلاقة: https://ageconsearch.umn.edu/record/312322/files/download.pdfTest; http://ageconsearch.umn.edu/record/312322Test
الإتاحة: https://doi.org/10.22004/ag.econ.312322Test
http://ageconsearch.umn.edu/record/312322Test
https://ageconsearch.umn.edu/record/312322/files/download.pdfTest -
4دورية أكاديمية
المؤلفون: Vroomen, Harry, Larson, Bruce
العلاقة: https://ageconsearch.umn.edu/record/312320/files/download.pdfTest; http://ageconsearch.umn.edu/record/312320Test
الإتاحة: https://doi.org/10.22004/ag.econ.312320Test
http://ageconsearch.umn.edu/record/312320Test
https://ageconsearch.umn.edu/record/312320/files/download.pdfTest -
5دورية أكاديمية
المؤلفون: Denbaly, Mark, Vroomen, Harry
المصدر: American Journal of Agricultural Economics, 1993 Feb 01. 75(1), 203-209.
الوصول الحر: https://www.jstor.org/stable/1242968Test
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6دورية أكاديمية
المؤلفون: Denbaly, Mark, Vroomen, Harry
العلاقة: https://ageconsearch.umn.edu/record/278575/files/ers-report-533.pdfTest; http://ageconsearch.umn.edu/record/278575Test
الإتاحة: https://doi.org/10.22004/ag.econ.278575Test
http://ageconsearch.umn.edu/record/278575Test
https://ageconsearch.umn.edu/record/278575/files/ers-report-533.pdfTest -
7دورية أكاديمية
المؤلفون: Vroomen, Harry L., McClelland, John W.
العلاقة: https://ageconsearch.umn.edu/record/270117/files/aaea-1987-127.pdfTest; https://ageconsearch.umn.edu/record/270117/files/aaea-1987-127.pdf?subformat=pdfaTest; http://ageconsearch.umn.edu/record/270117Test
الإتاحة: https://doi.org/10.22004/ag.econ.270117Test
http://ageconsearch.umn.edu/record/270117Test
https://ageconsearch.umn.edu/record/270117/files/aaea-1987-127.pdfTest
https://ageconsearch.umn.edu/record/270117/files/aaea-1987-127.pdf?subformat=pdfaTest -
8دورية أكاديمية
المؤلفون: Vroomen, Harry., Taylor, Harold, United States. Dept. of Agriculture. Economic Research Service.
مصطلحات موضوعية: Fertilizers
وصف الملف: bib
العلاقة: http://hdl.handle.net/2027/uiug.30112018391885Test; http://hdl.handle.net/2027/osu.32435024595134Test
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9دورية أكاديمية
مصطلحات موضوعية: Fertilizer industry, Fertilizers
وصف الملف: bib
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10دورية أكاديمية
المؤلفون: Vroomen, Harry., Larson, Bruce., United States. Dept. of Agriculture. Economic Research Service.
مصطلحات موضوعية: Fertilizers
وصف الملف: bib