Lake Canadohta

1967

1:24k

Lake Canadohta

1967

1:24k

Lake Canadohta

1967

1:24k

Union City

1929

1:63k

Union City

1932

1:63k

Union City

1932

1:63k

Union City

1932

1:63k

Warren

1983

1:100k

Map of the Oil Region of Pennsylvania.

1865

Townsend & Dale

1:158k

Geological map of Crawford and Erie Counties.

1880

Geological Survey of Pennsylvania

1:125k