Geological Survey (U.S.), Herron, William Harrison, b. 1865, and Thompson, A. H. (Almon Harris), 1839-1906. Department of the Interior, U.S. Geological Survey. Relief shown by contours and spot heights. Title in upper right corner: Texas, San Antonio quad... The Survey.
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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.