1997. Frushour, Samuel S., Harper, Denver, Kersey, Rea Williams, and Powell, Richard L. This map data was compiled in 1997 from information available at the time, but was unpublished until until 2002; the map does not reflect any chang... Indiana Geological Survey.
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1968. Powell, Richard L. Blue line print. 'Base prepared from Bloomington, Clear Creek, Stanford and Whitehall topographic quadrangles, U.S.G.S, by the Indiana Geological S...
1972. Powell, Richard L. Scale approximately 1:380,000 Compiled by Richard L. Powell ... Indiana Geological Survey.
1967. Powell, Richard L. Includes 2 location maps. Scale approximately 1:380,000. Compiled by Richard L. Powell. Indiana Department of Geology and Natural Resources.