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3. Berry, W.F., Spackman, W., Brisse, A.H. (producers and directors), 1962. The thermal behavior of coal constituents [film]. Available from College of Earth and Mineral Sciences, The Pennsylvania State University, University Park, PA.
4. Catalog of Fossil Spores and Pollen, 1957. Palynological Laboratories, Dept. of Geol., The Penn. State Univ., University Park, PA and Geochronology Laboratories, Univ. of Ariz.
5. Cohen, A.D., 1968. The petrology of some peats of southern Florida (with special reference to the origin of coal). The Pennsylvania State University, unpublished PhD Dissertation, University Park, PA, 370 pp.