Total intensity aeromagnetic map of Elkhart County, Indiana: relative to arbitrary datum
Includes text and location map. Scale approximately 1:63,500. 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.
Dempsey, W. J., Duffner, R. T., and Henderson, John R.