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Harper, John A., Donald M. Hoskins, and Jon D. Inners, 1983, Fossil Collecting in Pennsylvania, Pennsylvania Geological Survey: Harrisburg, Pennsylvania.
Kochanov, William E., 1999, Sinkholes in Pennsylvania, Educational Series 11, Pennsylvania Geological Survey: Harrisburg, Pennsylvania.
Sevon, W.D. and Gary M. Fleeger, 1999, Pennsylvania and the Ice Age, Educational Series 6, Pennsylvania Geological Survey: Harrisburg, Pennsylvania.
Subitzkey, Semour, ed., 1969, Geology of Selected Areas in New Jersey and Eastern Pennsylvania, Rutgers University Press: New Brunswick, New Jersey.
Sharnberger, Charles K., 1989, Earthquakes Hazard in Pennsylvania, Educational Series 10, Pennsylvania Geological Survey: Harrisburg, PA.
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