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Preliminary chart of San Pedro Harbor California : from a trigonometric survey under the direction of A.D. Bache Superintendent of the Survey of the Coast of the United States / triangulation by E.O.C. Ord, Capt. U.S.A. & W.E. Greenwell Assts topography by W.M. Johnson, Sub Assist hydrography by the party under the command of Comdr. James Alden U.S.N. Assist



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