New Buffalo and the marshes of Lake Pottowottomee at the mouth of the Galien River, Michigan shewing the facilities for constructing a harbor of refuge / from survey made in September 1857 by assistant John R. Mayer, under the direction of Brevet Lieut. C
The 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 3 feet of perpendicular elevation."; "Accompanying Lt. Colonel J.D. Graham's annual report (no. 200) to Chief Top. Engineer, dated Chicago, September 30th 1857."; "Map G. No. 54."; 1 map 65 x 101 c
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