Geological Survey of Pennsylvania , Pennsylvania Geological Survey (2d , 1874-1890 ), Pennsylvania State geologist (1874-1890 )., J. Peter Lesley , 1874-1890 Geological Survey (2d, Geological Survey of Pennsylvania , Pennsylvania Board of Commissio

Photo Geological Survey of Pennsylvania ,  Pennsylvania Geological Survey (2d ,  1874-1890 ),  Pennsylvania State geologist (1874-1890 ).,  J. Peter Lesley ,  1874-1890 Geological Survey (2d,  Geological Survey of Pennsylvania ,  Pennsylvania Board of Commissio
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