APA (7th ed.) Citation

(1988). The magnetic field in the United States, 1985: Total intensity chart. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

The Magnetic Field in the United States, 1985: Total Intensity Chart. Denver, CO u.a: U.S. Geological Survey, 1988.

MLA (9th ed.) Citation

The Magnetic Field in the United States, 1985: Total Intensity Chart. U.S. Geological Survey, 1988.

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