Pennsylvania

  • Pennsylvania Topographic and Geologic Survey: P.O. Box 8453 Harrisburg, PA 17105-8453 (717) 787-2169
  • Barns, John H., 1991, Rocks and Minerals of Pennsylvania, Educational Series 1, Pennsylvania Geological Survey: Harrisburg, Pennsylvania.
  • Barns, John H., and W. D. Sevon. 1996, The Geological story of Pennsylvania, Educational Series #4, Pennsylvania Geological Survey: Harrisburg, Pennsylvania.
  • Goodwin, B.K., 1964, Guidebook to the Geology of the Philadelphia Area, Bulletin G. 41, p. 18. Pennsylvania Geological Survey: Harrisburg, Pennsylvania.
  • 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.  
  • Shultz, Charles H., ed., 1999, The Geology of Pennsylvania, Pennsylvania Geological Survey and Pittsburg Geological Society: Harrisburg, Pennsylvania.
  • Van Diver, Bradford B., 1990, Roadside Geology of Pennsylvania, Mountain Press Publishing Company: Missoula, Montana.
  • Pennsylvania Minerals
  • Academy of Natural Sciences
  • Delaware Valley Earth Science Society