From Parts (In 6 layers) Depicts: 1877 Last modified almost 3 years ago. Unrectified.
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Map of North Allegheny, showing outcrops of the Pittsburgh and Upper Freeport coals / J.P. Lesley, state geologist ; I.C. White, ass't. geologist, 1876.
From Parts (In 6 layers) Depicts: 1877 Last modified almost 3 years ago. Unrectified. |
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