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1كتاب
المؤلفون: Sunderland, Keith D., Powell, Wilf, Symondson, William O. C., Leather, Simon R., Perlman, Steve J., Abram, Paul K.
المصدر: Jervis's Insects as Natural Enemies: Practical Perspectives ; page 415-589 ; ISBN 9783031238796 9783031238802
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2كتاب
المؤلفون: Sunderland, Keith, Powell, Wilf, Symondson, William O. C.
المصدر: Insects As Natural Enemies ; page 299-434 ; ISBN 9781402017346 9781402026256
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3كتاب
المساهمون: Powell, Wilf., EU-Workshop on Enhancement, Dispersal and Population Dynamics of Beneficial Insects in Integrated Agrosystems (3 ; 1995 ; Bristol).
المصدر: Bibliogr. przy referatach.