Terrestrial magnetism.
Magnetic declination in the United States for January 1, 1920 /
by Daniel L. Hazard.

APA Citation

U.S. Coast and Geodetic Survey., Hazard, D. L. (Daniel Lyman). (1922). Terrestrial magnetism: Magnetic declination in the United States for January 1, 1920. Washington: U.S. Govt. Print. Off..

MLA Citation

U.S. Coast and Geodetic Survey, and Daniel L. (Daniel Lyman) Hazard. Terrestrial Magnetism: Magnetic Declination In the United States for January 1, 1920. Washington: U.S. Govt. Print. Off., 1922.

Warning: These citations may not always be complete (especially for serials).