File:Second Geological Survey of Pennsylvania Report of Progress PPP plate 6.jpg

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Description Second Geological Survey of Pennsylvania. Report of Progress. PPP. Plate 6
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Source California/Internet Archive
Author Charles Emerson Beecher (1856-1904), James Hall (1811-1898), John Peter Lesley (1819-1903), John Simpson Africa (1832-1900)
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Date/TimeThumbnailDimensionsUserComment
current22:38, 20 June 2011Thumbnail for version as of 22:38, 20 June 20112,025 × 1,676 (1.88 MB)Enomil{{Information |Description=Second Geological Survey of Pennsylvania. Report of Progress. PPP. Plate 6 |Source=[http://babel.hathitrust.org/cgi/pt?id=uc2.ark:/13960/t9g44vp57 California/Internet Archive] |Date=1884 |Author=Charles Emerson Beecher (1856-190

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