Geophysical investigation maps, GP (series). 13. Total intensity aeromagnetic map of Potosi quadrangle, Mo., aeromagnetic survey 1946 by F. Keller, jr., and J. R. Henderson, 1948 by W. J. Dempsey and R. T. Duffner. Scale 1 m.=2 in., contour interval 50 gammas, n. p.

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