Tanner, G. F., Stellavato, J. N., and Mackey, J. C., 1981, Map of southwestern Gibson County, Indiana showing structure on Springfield Coal Member (V) of the Petersburg Formation (Pennsylvanian): Indiana Geological Survey Miscellaneous Map 32, scale 1:31,680.
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Keywords: Springfield Coal Member, Petersburg Formation, Pennsylvanian, map, structure, coal, energy resources, Carbondale Group
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