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Apple Powdery Mildew and Its Control in the Pajaro Valley

William Salisbury BallardWilliam Hunter Volck

出版	U.S. Department of Agriculture, 1914
URL	http://books.google.com.hk/books?id=AxMiwEyX4CkC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

Of control methods. pp. 26.