Geological map of Centre County.

Geological map of Centre County. To illustrate report of progress T4 by E.V. d'Invilliers, Asst. Geologist. 1883. Julius Bien & Co., Photo. Lith. New York. Lane S. Hart, State Printer. Grand atlas, Division I, Part I. Sheet no. VIII.

Geological Survey of Pennsylvania

1883

1885

Second Geological Survey of Pennsylvania

1:125 000

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