United States Coast and Geodetic Survey. "Issued March 1888, F.M. Thorn, Superintendent." "Triangulation by G. Davidson, J.S. Lawson and J.J. Gilbert, Assistants, between 1857 and 1886 ; topography by E. Ellicott and J.J. Gilbert, Assistants in 1877 and 1886 ; hydrography by Lieut. R.D. Cutts, U.S.N. Assistant in 1877 ; verification of hydrography by Lieut. Comdr. W.H. Bawnson, U.S.N. Inspector of Hydrography." "No. 6451." Relief shown by contours. Depths shown by soundings. Includes table for tide calculation.
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