United States Coast and Geodetic Survey. Relief shown by contours and spot heights; depths shown by soundings and isolines. Shows drainage, railroads, etc. "Triangulation by G. Davidson, E.O.C. Ord, U.S.A., W.E. Greenwell, A.W. Chase, D.B. Wainwright, and A.F. Rodgers, Assistants ... topography by A.W. Chase and W.M. Johnson, Assistants ... hydrography by Lieut. E.H.C. Leutze, Lieut. Comdr. H.C. Taylor, U.S.N., and G. Davidson, Assistants ... astronomical observations by G. Davidson, Assistant ... magnetic observations by W.P. Trowbridge, U.S.A., and H.E. Nichols, U.S.N. Assistants ..." Contour interval 20 ft. Oriented with north toward upper right. Inset map: San Pedro Harbor. Scale 1:10,000. Includes text.