triangulation by A.M. Harrison in 1863 ; topography [by A.M. Harrison] in 1867 and '68 ; hydrography by F.P. Webber in 1867 ; verified, J.E. Hilgard. Depths shown by soundings. Includes notes on soundings and tides. "No. 351"--Upper left margin. "Plate no. 1111"--Upper margin.
Creator:
Harrison, A. M. (Alexander Medina), 1829-1881 and Hilgard, J. E. (Julius Erasmus), 1825-1891
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