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Annual Report on the Geological Survey of the State of Pennsylvania
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Geological Survey of Pennsylvania: Laurentian, Huronian, Cambrian and Lower Silurian formations, by J.P. Lesley
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Annual Report of the Geological Survey of Pennsylvania for 1885-1887
Includes 3 atlases of fold. plates, fold. maps, fold. tab. which accompany 1885; 1886, pts. 3-4.
