Books by Crab Island U.S. Coast and Geodetic Survey. Magnetic Observatory:
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U.S. Coast and Geodetic Survey. Magnetic Observatory, Crab Island, Porto Rico: Results of observations made at the United States Coast and Geodetic Survey Magnetic Observatory at Vieques, Porto Rico ... (Govt. Print. Off., 1903), also by U.S. Coast and Geodetic Survey, Daniel L. Hazard, and P.R.) U.S. Coast and Geodetic Survey. Magnetic Observatory (Vieques (page images at HathiTrust)
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