APA (7th ed.) Citation

Geological Survey (U.S.). (1979). Oregon [base map]. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). Oregon [base Map]. Reston, Va.: The Survey, 1979.

MLA (9th ed.) Citation

Geological Survey (U.S.). Oregon [base Map]. The Survey, 1979.

Warning: These citations may not always be 100% accurate.