Lawrence, Mercer, Beaver, Butler counties.

1872

Gray, Ormando Willis; Walling, H. F.

1:300k

Erie, Crawford, Venango counties.

1872

Gray, Ormando Willis; Walling, H. F.

1:300k

Sandy Creek Township.

1865

F.W. Beers & Co.

1:51k

Plate D. West Central Pennsylvania.

1871

Hopkins, G.M.

Map of the Oil Region of Pennsylvania.

1865

Townsend & Dale

1:158k

Irwin Township.

1865

F.W. Beers & Co.

1:32k

Plate A. Northwest Pennsylvania.

1871

Hopkins, G.M.

Youngstown Municipal Airport: Youngstown Ohio : Vicinity map

1952

United States. Air Force

1:500k

Pennsylvania.

1912

Rand McNally and Company

1:380k

Pennsylvania (western part).

1948

Hammond, C.S.

1:585k