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Undated map of the Portland, Rutland, Oswego and Chicago Railroad, drawn on an 1862 "Map shewing the several routes proposed for the passage of gunboats to the Lakes via: Erie and Oswego Canal; Champlain [Canal]; Illinois River and Chicago [Canal]; Wisconsin, Green Bay [Canal] Prepared by S. H. Sweet, Dep. State Engr. and Surveyor." From [1].
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