1931. 2012-04-04T14:19:25Z. 2015-10-21T15:21:48Z. United States. War Dept. Corps of Engineers. U.S. Lake Survey Office. English. Public. Superior, Lake, Harbors, Michigan, Grand Marais, and Superior, Lake.
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1933. 2012-04-04T14:29:50Z. 2015-10-21T15:21:48Z. United States. War Dept. Corps of Engineers. U.S. Lake Survey Office. English. Public. Superior, Lake and Superior, Lake.
1934. 2012-04-04T14:06:22Z. 2015-10-21T15:21:48Z. U.S. Lake Survey. U.S. Lake Survey Office. English. Public. Superior, Lake, Saint Marys River (Mich. and Ont.), and Superior, Lake.
4. Grand Island : including south coast of Lake Superior : from Grand Portal to Au Train Point, Mich
1934. 2012-04-20T17:06:10Z. 2015-10-21T15:22:09Z. U.S. Lake Survey. U.S. Lake Survey Office. English. Public. Grand Island (Alger County, Mich.), Superior, Lake, and Superior, Lake.
1933. 2012-04-04T16:35:03Z. 2015-10-21T15:21:49Z. U.S. Lake Survey. U.S. Lake Survey Office. English. Public. Superior, Lake, Superior, Lake., and Grand Marais (Minn.).
1934. 2012-04-20T17:27:24Z. 2015-10-21T15:22:10Z. U.S. Lake Survey. U.S. Lake Survey Office. English. Public. Michigan, Marquette, Marquette Bay (Marquette County, Mich.), Superior, Lake., and Superior, Lake.