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2. Affolter, R.H., 1977. Geochemistry of mineral matter and selected trace elements or the Herrin (No. 6) and Springfield-Harrisburg (No. 5) coal in northwestern Illinois. Unpublished MS thesis, Northeastern Illinois University, Chicago, IL.
3. Allen, A.V., 1986. Geochemistry of the Mecca Quarry Shale and Colchester Coal, Linton Formation (Middle Pennsylvanian), in Parke and Vermillion counties, Indiana. Unpublished MS thesis, University of Missouri, Kansas City, MO.
4. Anderson, J.L., 1985. Palynology of the Lower Kittanning (No. 5) Coal (Pennsylvanian) of eastern Ohio. Unpublished MS thesis, Kent State University, Kent, OH. 130 pp.
5. A stable isotope study on the origin of permineralized peat zones in the Herrin Coal;Anderson;Journal of Geology,1980