The Twin Ports, Duluth-Superior harbor
Subtitle: Minnesota and Wisconsin
Contributors: United States. Army. Corps of Engineers. Detroit District
Publisher: US Army Corps of Engineers, Detroit District
Published: 1993
Place of publication: [Detroit, Mich.?]
Language: eng
Subjects: Harbors -- Minnesota -- Duluth; Harbors -- Wisconsin -- Superior
Notes: Shipping list no.: 93-0395-P