Total intensity aeromagnetic map of Lake County, Indiana [map] : relative to arbitrary datum / United States Department of the Interior, Geological Survey ; aeromagnetic survey 1947 by W.J. Dempsey, J.R. Henderson, R.T. Duffner ; compilation directed by J.R. Henderson ; prepared in cooperation with Indiana Department of Conservation, Division of Geology

Corporate Author: Geological Survey (U.S.)
Published: [Washington, D.C.] : For sale by U.S. Geological Survey, 1949.
Physical Description: 1 map ; on sheet 60 x 109 cm, folded in envelope 30 x 23 cm.
Additional Creators: Dempsey, W. J., Duffner, R. T., Henderson, John R., and Indiana. Division of Geology