Total intensity aeromagnetic map of Benton County, Indiana: relative to arbitrary datum
Includes text and location map. Scale 1:63360. United States Department of the Interior, Geological Survey; aeromagnetic survey 1947 by W.J. Dempsey, J.R. Henderson and R.T. Duffner; prepared in cooperation with Indiana Department of Conservation, Division of Geology.
Dempsey, W. J., Duffner, R. T., and Henderson, John R.