46. Total Intensity aeromagnetic map [and accompanying aeromngnetic profiles] of parts of Clearwater. Polk, and Red Lake Counties, Minn., aeromagnetic survey 1947 by J. R. Balsey and M. E. Hill. Scale 1 m. = 1 in. for map and 1 m. = 0.5 in. for profiles, contour interval 50 and 250 gammas, n. p.

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