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1. Manitowoc harbor, Wisconsin from survey made betweenteh 14th & 19th of August 1856 by assistant John O'Donoghue, under the direction of Brevet Lieut. Col. J.D. Graham, Major, U.S. Top. Engineers. Superintending Engineer of Lake Michigan Works.

Notes:
The soundings are in feet & decimals of a foot."; "Accompanying Lt. Colonel J.D. Graham's annual report (no. 161) to the Chief Topographical Engineer, dated Chicago, November 15th 1857."; "Map G. No. 46."; 1 map 51 x 61 c
Data Provider:
University of Michigan. Libraries
Collection:
UM Clark Library Maps