The Twin Ports, Duluth/Superior harbor, Minnesota and Wisconsin
Contributors: United States. Army. Corps of Engineers. Detroit District
Publisher: US Army Corps of Engineers, Detroit District
Published: 1986
Place of publication: [Detroit, Mich.?]
Language: eng
Subjects: Harbors -- Minnesota -- Duluth; Harbors -- Wisconsin -- Superior
Notes: Shipping list no.: 86-807-P