1906. Derby, George M., Dunaway, Horace, U.S. Lake Survey, and United States. Army. Corps of Engineers. Cartographic Details: Scale 1:20,000. "Reproduced in colors in 1906 by ..." Relief shown by contours and soundings. "Soundings, in feet, are reduce... U.S. Lake Survey ; Detroit, Michigan.
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1910. A. Hoen & Co., Bayley, William Shirley, 1861-1943, and U.S. Lake Survey. Cartographic Details: Scale 1:22500. "By W.S. Bayley, 1890." Relief shown by contours. Includes 2 cross section insets and legend of rock types. "M... U.S. Geological Survey (Washington, D.C.), 1910.