2000. Eaton, Nathan (Cartographer) and Weber, Licia. Compilation complete through October 1997.' 'Base map digitized from 1:500,000 scale, 1978 U.S. Geological Survey map of Indiana.' Includes text an... 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.