Geological Survey (U.S.) and Douglas, Edward Morehouse, 1855-1932. Relief shown by contours and spot heights. "E.M. Douglas, Geographer in charge. Topography by Richard T. Evans. Triangulation by H.L. Baldwin, Jr. ... U.S. Geological Survey.
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Geological Survey (U.S.), Douglas, Edward Morehouse, 1855-1932, and Matthes, François, 1874-1948. U.S. Geological Survey ; E.M. Douglas, geographer in charge ; topography by Franc̜ois E. Matthes. Surveyed in 1902-1903. "Contour interval 50 feet....