Patterson, C. P. (Carlile Pollock), 1816-1881 and Hilgard, J. E. (Julius Erasmus), 1825-1891. C.P. Patterson, superintendent ; verified J.E. Hilgard, assist. in charge of office and topography ; triangulation and topography by L.A. Sengtelle... United States Coast and Geodetic Survey.
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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.