USGS · gp600
Aeromagnetic map of the Perch Lake quadrangle, Houghton, Baraga, and Iron Counties, Michigan
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Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey. 1967. Aeromagnetic map of the Perch Lake quadrangle, Houghton, Baraga, and Iron Counties, Michigan. https://doi.org/10.3133/gp600
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