APA (7th ed.) Citation

Geological Survey (U.S.). (1960). State of Maine: [base map] (Ed. of 1960.). The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). State of Maine: [base Map]. Ed. of 1960. Washington, D.C.: The Survey, 1960.

MLA (9th ed.) Citation

Geological Survey (U.S.). State of Maine: [base Map]. Ed. of 1960. The Survey, 1960.