File:Second Geological Survey of Pennsylvania Report of Progress PPP plate 7.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:39, 20 June 2011 | 1,017 × 2,129 (926 KB) | Enomil | {{Information |Description=Second Geological Survey of Pennsylvania. Report of Progress. PPP. Plate 7 |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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