Geological map McKean County, and a map of a portion of Cattaraugus County, New York to exhibit the horse-shoe bend in the Allegheny River.

Geological map McKean County, and a map of a portion of Cattaraugus County, New York to exhibit the horse-shoe bend in the Allegheny River. 1879. By Chas. A. Ashburner, Asst. Geologist. A.W. Sheafer, Aid. Julius Bien Photolith. Lane S. Hart, State Printer. Grand atlas, Division I, Part I. Sheet no. XXXII.

Geological Survey of Pennsylvania

1879

1885

Second Geological Survey of Pennsylvania

1:95 000

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