compiled by S. G. Elliott, C.E. 1860 ; lith. of Britton & Co. San Francisco. Relief shown by hachures. Coordinates approximate and based on Greenwi... G.W. Welch.
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Geological Survey (U.S.) and Thompson, A. H. (Almon Harris), 1839-1906. Relief shown by contours. Contour interval 20 feet. "A.H. Thompson, Geographer ; E.M. Douglas, Topographer in charge ; Triangulation by E.M. Dougla... U.S. Geological Survey.