1951. Patton, John B. (John Barratt), 1915-. Blue line.; August, 1951.; Not for publication, for correspondence use only--Upper margin. Scale approximately 1:1,500,000. Indiana Dept. of Conservation, Geological Survey.
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1951. Moran, W. H.(William H.), cartographer. November, 1951.; Blue line print.; Traced from compilation proof sheets of new base map of Indiana, prepared by the U.S. Geological Survey. Minor a... Indiana Geological Survey.