APA (7th ed.) Citation

Geological Survey (U.S.). (1999). State of California, North Half, Scale 1: 500,000, Revised 1981. [publisher not identified].

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). State of California, North Half, Scale 1: 500,000, Revised 1981. [Place of publication not identified]: [publisher not identified], 1999.

MLA (9th ed.) Citation

Geological Survey (U.S.). State of California, North Half, Scale 1: 500,000, Revised 1981. [publisher not identified], 1999.