Front cover image for Insect pollination of cultivated crop plants

Insect pollination of cultivated crop plants

Samuel Emmett McGregor, United States Department of Agriculture
eBook, English, [1999?-]
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[USDA?], [Washington?], [1999?-]
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Based on the book of the same title by S.E. McGregor, USDA; originally published 1976
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