Hazard, D. L. (1935). Results of observations made at the United States Coast and Geodetic Survey Magnetic Observatory near Tucson, Arizona in 1927 and 1928. Coast and Geodetic Survey.
Chicago-Zitierstil (17. Ausg.)Hazard, Daniel Lyman. Results of Observations Made at the United States Coast and Geodetic Survey Magnetic Observatory Near Tucson, Arizona in 1927 and 1928. Washington: Coast and Geodetic Survey, 1935.
MLA-Zitierstil (9. Ausg.)Hazard, Daniel Lyman. Results of Observations Made at the United States Coast and Geodetic Survey Magnetic Observatory Near Tucson, Arizona in 1927 and 1928. Coast and Geodetic Survey, 1935.
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