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Keywords: Second Geological Survey of Pennsylvania Report of Progress PPP table.jpg Second Geological Survey of Pennsylvania Report of Progress PPP Table http //babel hathitrust org/cgi/pt id uc2 ark /13960/t9g44vp57 California/Internet Archive 1884 Charles Emerson Beecher 1856-1904 James Hall 1811-1898 John Peter Lesley 1819-1903 John Simpson Africa 1832-1900 PD-old Second Geological Survey of Pennsylvania Report of Progress PPP |