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Water Resources of the Philadelphia District, by Florence Bascom. [U.S. Geological Survey Water Supply and Irrigation Paper No. 106. Series M, General Hydrographic Investigations, 12. Series O, Underground Waters, 26.].

Florence BascomUnited States. Congress. House

出版	U.S. Government Printing Office, 1904
URL	http://books.google.com.hk/books?id=mtEFzQEACAAJ&hl=&source=gbs_api