Douglas, E. M. (Edward Morehouse), 1855-1932. Relief shown by contours and spot heights. "E.M. Douglas, Geographer in charge. Topography by R.H. Sargent. Triangulation by T.M. Bannon. Surveyed ... U.S. Geological Survey.
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Gannett, Henry, 1846-1914 and Douglas, E. M. (Edward Morehouse), 1855-1932. Henry Gannett, chief cartographer ; E.M. Douglas, topographer in charge ; triangulation and topography by R.H. Chapman. Relief shown by contours, h... Department of the Interior, U.S. Geological Survey.