Text: Technology. (Pittsburgh (Pennsylvania). Map: Pittsburgh Market Map.

1950

Nirenstein, Nathan

1:90k

Lawrence, Mercer, Beaver, Butler counties.

1872

Gray, Ormando Willis; Walling, H. F.

1:300k

Pittsburgh.

1924

Rand McNally and Company

1:380k

Plate D. West Central Pennsylvania.

1871

Hopkins, G.M.

Jefferson, Clarion, Indiana, Armstrong counties.

1872

Gray, Ormando Willis; Walling, H. F.

1:300k

A General Map of the River Ohio, Plate the first.

1796

Tardieu, P.F.

1:317k

Pennsylvania.

1912

Rand McNally and Company

1:380k

Greater Pittsburgh Airport : Coraopolis, Pennsylvania : Vicinity map

1951

United States. Air Force

1:500k

Youngstown Municipal Airport: Youngstown Ohio : Vicinity map

1952

United States. Air Force

1:500k

Pennsylvania (western part).

1948

Hammond, C.S.

1:585k