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Studies of the Irrigation of Pear Orchards on Heavy Soil Near Medford, Oreg

Mortimer Reed LewisWillard Walker AldrichRobert Archibald Work

出版	U.S. Department of Agriculture, 1934
URL	http://books.google.com.hk/books?id=v0NTjHemjx8C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN