Lawrence, Mercer, Beaver, Butler counties.

1872

Gray, Ormando Willis; Walling, H. F.

1:300k

Map of the Oil Region of Pennsylvania.

1865

Townsend & Dale

1:158k

Erie, Crawford, Venango counties.

1872

Gray, Ormando Willis; Walling, H. F.

1:300k

Plate A. Northwest Pennsylvania.

1871

Hopkins, G.M.

Indian River From Bethel Creek to Indian River Inlet

1884

C&GS

1:25k

Atlas of Ohio : Connecticut "Western Reserve"

1868

Lloyd, H.H.

1:300k

Youngstown Municipal Airport: Youngstown Ohio : Vicinity map

1952

United States. Air Force

1:500k

Pennsylvania (western part).

1948

Hammond, C.S.

1:585k

Pittsburgh & Western Pennsylvania : Coal & coke fields, oil regions & location of natural gas wells & gas mains leading to Pittsburgh

1876

Caldwell, J. A. (Joseph A.)

1:400k

Post Route Map of the State of Pennsylvania (Western Sheet) ... January 15, 1948.

1948

United States. Post Office Department

1:318k