Citation Data
MLA
Geological Survey (U.S.). Duluth, Minnesota--Wisconsin : 1:100 000-Scale Metric Topographic Map. Reston, Va. :The Survey, 1980.
APA
Geological Survey (U.S.). (1980). Duluth, Minnesota--Wisconsin : 1:100 000-scale metric topographic map [Map]. Reston, Va. :The Survey,
Chicago
Geological Survey (U.S.). “Duluth, Minnesota--Wisconsin : 1:100 000-Scale Metric Topographic Map.” Reston, Va. :The Survey, 1980.
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