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A Comparative Study of Dusting by Means of Airplane and Ground Machine for the Control of the Blueberry Maggot

Frank Heidtman Lathrop

出版	U.S. Department of Agriculture, 1930
URL	http://books.google.com.hk/books?id=VfWt5HqpVfsC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN