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Rea Williams, and Powell, Richard L. This map data was compiled in 1997 from information available at the time, but was unpublished until until 2002; the map does not reflect any chang...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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2000. Dintaman, Christopher R., Frushour, Samuel S., Harper, Denver, and Sowder, Kimberly H. Digital cartogrpahy by Kimberly H. Sowder.' Includes text, index map, location map, and 'Sources of subsurface dye trace information.' Scale 1:500,... Indiana Geological Survey.