Graham, J. D. (James Duncan), 1799-1865Mayer, J. R. (John R.)United States. Army. Corps of Topographical EngineersThe soundings are in feet & tenths of a foot. "The figures on land express the elevations above the lake surface in feet and decimals. The horizontal curves or contour lines are drawn at intervals of 5 feet of perpendicular elevation." "Accompanying Lt. Colonel J.D. Graham's annual report (no. 161) to the Chief Topographical Engineer, dated Chicago, November 15th 1857." "Map G. No. 47." 1 map; 66 x 96 cmJPEG9b9603a7-e0b0-454a-b73d-4861201d72d4engPublicSt. Joseph harbor, Michigan from survey made between the 14th & 27th August 1856 by assistant John R. Mayer, under the direction of Brevet Lieut. Col. J.D. Graham, Major, U.S. Top. Engineers. Superintending Engineer of Lake Michigan Works.MapsMichigan--Saint Joseph RiverMichigan1856University of Michigan