1970. Hollingsworth, John McHenry, 1823-1889 and Kingsbury, Robert C. Shows primary and secondary recreation areas, recreation areas under construction, lookout towers, acquisition boundary (purchase unit), and Hoosie... Department of Geography, Indiana University.
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1965. author. and Kingsbury, Robert C. Shows recreation areas. Scale approximately 1:370,000. Robt. C. Kingsbury. Department of Geography, Indiana University.