Relief shown by form lines and spot heights. "Twentieth annual report; pt. 7, map no. 20." Lith. by A. Hoen & Co., Baltimore, MD. "Topography by Emil Mahlo, Lieutenant P. G. Lowe, U.S.A., and F. C. Schrader, U.S. Geological Survey."...
Relief shown by form lines and spot heights. "Twentieth annual report; pt. 7, map no. 20." Lith. by A. Hoen & Co., Baltimore, MD. "Topography by Emil Mahlo, Lieutenant P. G. Lowe, U.S.A., and F. C. Schrader, U.S. Geological...
Relief shown by contours and spot heights. "Topography by D.C. Witherspoon with additional areas from maps my T.G. Gerdine and W.S. Peters." "Professional Paper No. 41, Plate XX."
Published in [Washington, D.C.] by the Geological Survey...