Hilgard, J. E. (Julius Erasmus), 1825-1891. United States Coast and Geodetic Survey. Depths shown by shading and by soundings in feet. "Issued May 1884, J.E. Hilgard, superintendent. Verified... United States Coast and Geodetic Survey.
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United States Coast and Geodetic Survey. Depths shown by shading and by soundings in feet. "Issued May 1888, F.M. Thorn, superintendent. Verified, ... United States Coast and Geodetic Survey.