1949. Dempsey, W. J., Duffner, R. T., and Henderson, John R. Includes text and location map. Scale 1:63360. United States Department of the Interior, Geological Survey; aeromagnetic survey 1947 by W.J. Dempse... For sale by United States Geological Survey.
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1949. Dempsey, W. J., Duffner, R. T., and Henderson, John R. Includes text and location map. Scale approximately 1:75,600. By W.J. Dempsey, J.R. Henderson, R.T. Duffner; compilation directed By J.R. Henderson... For sale by United States Geological Survey.