Geophysical investigations maps, GP (series). 49. Total intensity aeromagnetic map [and accompanying aeromagnetic profiles] of northern part of Otter Tail County, Minn., aeromagnetic survey 1947 by J. R. Balsley and M. E. Hill. Scale 1 m.=1 in. for map, 1 m.=0.5 in, for profiles, contour interval 50, 250 and 1000 gammas, n. p.

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