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Soil Survey of Washington County, Ohio

Samuel Williams PhillipsRalph Emanuel BlaneyGeorge Henry DrewesAlfred H. PaschallHoward Malcolm Smith

出版	U.S. Government Printing Office, 1930
URL	http://books.google.com.hk/books?id=ZQR8RV4uiJgC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN