Geological map of Allegheny County.

Geological map of Allegheny County. J.P. Lesley, State Geologist. J.J. Stevenson Asst. Geologist. I.C. White, Asst. Geologist. 1876. Julius Bien & Co. Photolith. New York. Lane S. Hart, State Printer. 1877. Grand atlas, Division I, Part I. Sheet no. II.

Geological Survey of Pennsylvania

1876

1885

Second Geological Survey of Pennsylvania

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