Map of portions of McKean County, Pennsylvania and Cattaraugus County, New York showing the outlines of the proven oil territory.

Map of portions of McKean County, Pennsylvania and Cattaraugus County, New York showing the outlines of the proven oil territory. May 1st 1880. To illustrate report of progress R. J.P. Lesley, State Geologist. Chas. A. Ashburner, Asst. Geologist and A.W. Sheafer, aid. Julius Bien & Co. Lith. Lane S. Hart, State Printer. Report R, plate XVII. Grand atlas, division III, part I, sheet no. III.

Geological Survey of Pennsylvania

1880

1885

Second Geological Survey of Pennsylvania

1:95 040

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