1954. Carter, Lee (Cartographer). Pictorial map. Cited in LC's Trails bibliography, no. 111. Scale 1:600,000. Lee Carter, cartographer, 1932. Indiana Department of Conservation.
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1932. Conservation Commission, Stanley Coulter, Chairman.' 'The base used ... is the Ryse map, which has been modified.' Includes geologic cross sections... Indiana Department of Conservation.
1923. Pickens, R. F. and Sauers, Chas. G. (Charles G.). Map furnished by Indiana State Highway Commission.' 'Information on hotels, trains and accommodations in state parks compiled by Chas. Sauers'--Map... Indiana Department of Conservation.