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Potential Cropland Study

Raymond Ivan DideriksenAllen R. HidleboughAllen Ray HidlebaughKeith O. Schmude

出版	Department of Agriculture, Soil Conservation Service, 1977
URL	http://books.google.com.hk/books?id=_XwWAAAAYAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN