Geophysical investigations, maps. Total Intensity aeromagnetic map [and accompanying aeromagnetic profiles] of southern part of Crow Wing County, Minn., aeromagnetic survey 1947 by .1. R. Henderson and M. E. Hill. Scale 1 m.= 1 in. for map and 1 m.= 0.5 in. for profiles, contour interval 50 gammas, n. p.

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