Book digitized by Google from the library of University of California and uploaded to the Internet Archive by user tpb. At head of title: Second geological survey of Pennsylvania: 1874 Appendix: Extracts from H.D. Rogersʹ Memoir on the coal formation of Pennsylvania ... of the final report of the geology of Pensylvania
Read book Report of Progress in the Clearfield And Jefferson District of the Bituminous Coalfields of Western Pennsylvania for free
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