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Soils of Pennsylvania
其他書名
A Statement of the Origin and Capacity of the Soils of Various Counties, Including a Discussion of the Same by Townships, of the Counties East of the Allegheny Mountains, Together with Suggestions of Their Adaptation to the Different Crops Grown
出版W. S. Ray, state printer, 1914
URLhttp://books.google.com.hk/books?id=KZLgAAAAMAAJ&hl=&source=gbs_api