Geological map of Crawford and Erie Counties.

1880

Geological Survey of Pennsylvania

1:125k

Erie

1985

1:100k

Erie

1988

1:100k

Lake Erie Dunkirk to Erie and Long Point

1906

U.S. Lake Survey

1:80k

Lake Erie Dunkirk to Erie and Long Point

1914

U.S. Lake Survey

1:80k

Erie

1900

1:63k

North East

1915

1:63k

Erie

1900

1:63k

Fairview

1900

1:63k

Fairview

1900

1:63k