Sea and swell observations; wave characteristics, waves of the sea, how to make observations, reporting procedure United States. Hydrographic Office. contributor text book Washington, D.C. : U.S. Navy Hdrographic Office 1950 1950
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ENG Reprinted 1952. Cover: Hydrographic Office observers manual. Ocean waves GC211 .U54 1951 H.O. pub, no. 606-e https://www.biodiversitylibrary.org/bibliography/39186 6290806 10.5962/bhl.title.39186 CLE