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Annual Report of the Geological Survey of Pennsylvania....1885-1887: Map and section along the Lehigh River, sheet no. 1
Geological Survey of PennsylvaniaPennsylvania. Board of Commissioners for the Second Geological Survey
出版Board of Commissioners for the Second Geological Survey, 1887
URLhttp://books.google.com.hk/books?id=ROgbAAAAMAAJ&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN
註釋Includes 3 atlases of fold. plates, fold. maps, fold. tab. which accompany 1885; 1886, pts. 3-4.