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Field-plot Comparisons of DDT and Other New Materials for Control of Caterpillars on Cabbage

出版	United States Department of Agriculture, Agricultural Research Administration, Bureau of Entomology and Plant Quarantine, 1949
URL	http://books.google.com.hk/books?id=HIdHAQAAIAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN