From Parts (In 6 layers) Depicts: 1877 Last modified over 1 year ago. 5 control points.
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Map of Beaver County showing outcrops of the Pittsburgh, Upper Freeport and Kittanning coals / Second Geological Survey of Pennsylvania ; J.P. Lesley, state geologist ; I.C. White, ass't. geologist, 1876.
From Parts (In 6 layers) Depicts: 1877 Last modified over 1 year ago. 5 control points. |
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