Books by W. N. McFarland:
Books in the extended shelves:
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McFarland, W. N. (William Norris), 1886-1950: Magnetic declination in the United States, 1935 (U.S. Govt. Print. Off., 1937), also by U.S. Coast and Geodetic Survey and Daniel L. Hazard (page images at HathiTrust)- McFarland, W. N. (William Norris), 1886-1950: Results of observations made at the United States Coast and Geodetic Survey magnetic observatory at Vieques, P.R., in 1923 and 1924 (Washington, D.C. : G.P.O., 1931., 1931), also by U.S. Coast and Geodetic Survey (page images at HathiTrust)
Find more by W. N. McFarland at your library, or elsewhere.