38679
Frushour, Sam S., Harper, Denver, Powell, Richard L.
2002
MM64
Powell, R. L., Frushour, S. S., and Harper, D., 2002, Distributions of sinkholes, sinking-stream basins, and cave openings in southeastern Indiana: Indiana Geological Survey Miscellaneous Map 64, scale 1:250,000.
Indiana Geological & Water Survey - Miscellaneous Map 64