Pittsburgh and vicinity, Pennsylvania

1962

Geological Survey (U.S.)

1:24k

Carnegie

1906

1:63k

Carnegie

1904

1:63k

Pittsburgh

1904

1:63k

Pittsburg

1907

1:63k

Pittsburgh

1907

1:63k

Pittsburg

1907

1:63k

Pittsburgh

1907

1:63k

Carnegie

1906

1:63k

Carnegie

1906

1:63k