Penn. geological formations.
Topographical map of Pennsylvania, colored for the principal geological formations, by J. Peter Lesley, Philadelphia. Engraved by W.S. Barnard, N.Y. (Published by Stedman, Brown & Lyon, Philadelphia, 1872)
David RumseyLesley, J. P. (J. Peter), 1819-1903
1872
1872
Stedman, Brown & Lyon
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