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Smithsonian Libraries contributed to BHL
Guide to the study of insects and a treatise on those injurious and beneficial to crops, for the use of colleges, farm-schools, and agriculturists, by A. S. Packard, jr., M. D. With fifteen plates and six hundred and seventy wood-cuts.
Packard, A. S. (Alpheus Spring), 1839-1905
keywords: Insects;    Beneficial insects;    Insect pests;   
Subject:植物学
美国
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