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?t=t&id=57268802 Geological map of Allegheny County / Second Geological Survey of Pennsylvania ; J.P. Lesley, state geologist ; J.J. Stevenson, asst. geologist ; I.C. White, asst. geologist, 1876.
From Parts (In 6 layers) Depicts: 1877 Last modified about 2 years ago. Unrectified.
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