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Soil Survey, Union County, Pennsylvania

Samuel Rankin BaconDavid TaylorAlfred BoileauGerald Yoder

出版	U.S. Department of Agriculture, Agricultural Research Administration, Bureau of Plant Industry, Soils and Agricultural Engineering, 1946
URL	http://books.google.com.hk/books?id=2PFl3MISMF0C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN