Information for this book was complied from an extensive variety of sources, including books, websites, technical journals, and newspaper articles. The following books provide in-depth and frequently technical information on sinkholes and karst:

• Beck, Barry, editor, Karst Geohazards: Engineering and Environmental Problems in Karst Terrane (Boston: A.A. Balkema,1995)
• Beck, Barry F., editor, Sinkholes: Their Geology, Engineering, and Environmental Impact (Boston: A.A. Balkema, 1984).
• Drew, David, Karst Processes and Landforms (London: MacMillan Education, 1985).
• Ford, Derek C. and Williams, Paul, Karst Geomorphology and Hydrology (Winchester, MA: Unwin Hyman, 1989).
• Herak, M., and Stringfield, V.T., editors, Important Karst Regions of the Northern Hemisphere  (New York: Elsevier Publishing, 1972).
• Jakucs, Lazlo, Morphogenetics of Karst Regions (Bristol, England: Adam Hilger, Ltd., 1977).
• Jennings, J.N., Karst Geomorphology (New York: Basil Blackwell, Inc., 1985).
• Klimchouk, A.B., D.C. Ford, A.N. Palmer, and W. Dreybrodt, Speleogenesis: Evolution of Karst Aquifers (Huntsville, AL: National Speleological Society, 2000)
• Sweeting, Marjorie M., Karst Landforms (New York: Columbia University Press, 1973).
• Trudgill, Stephen, Limestone Geomorphology (New York: Longman Group Ltd., 1985).
• White, William B., Geomorphology and Hydrology of Karst Terrains (New York: Oxford University Press, 1988).
• Williams, Paul W., editor, Karst Terrains: Environmental Changes and Human Impact (Germany: Catena Verlag, 1993).
• Wycoff, Jerome, Rock, Time, and Landforms (New York: Harper and Row, 1966).
• Larousse Encyclopedia of the Earth (England: Paul Hamlyn Ltd., 1961).

Less technical in nature, these books provide general information about sinkholes, caverns, and karst: 

• Erickson, Jon, The Changing Earth: Quakes, Eruptions, and Other Geologic Cataclysms  (New York: Facts on File, Inc., 1994).
• Erickson, Jon, Craters, Caverns, and Canyons: Delving Beneath the Earth’s Surface (New York: Facts on File, Inc., 1993).
• Harrison, David L, The World of American Caves (Chicago: Reilly & Lee Books, 1970).
• Jackson, Donald Dale, Planet Earth: Underground Worlds (Alexandria, VA: Time-Life Books, 1982).
• Lambert, David, The Field Guide to Geology (New York: Facts on File, Inc., 1988)
• Moore, George W. and G. Nicolas Sullivan, Speleology: The Study of Caves  (Cave Books, 1978).
• Tufty, Barbara, 1001 Questions Answered About Natural Land Disasters (New York: Dodd, Mead, and Company, 1969)
• Veni, G., H. Duchene, N.C. Crawford, C.G. Groves, G.N. Huppert, E.H. Kastning, R. Olson, and B.J. Wheeler, Living With Karst: A Fragile Foundation (Arlington, VA: American Geological Institute, 2001)
• Zokaites, Carol, editor, Living on Karst: A Reference Guide for Landowners in Limestone Regions (Glen Allen, VA: Cave Conservancy of the Virginias, 1997)

Geological Survey websites are treasure troves of information about sinkholes in your region. Many states and provinces offer booklets and educational materials on sinkholes.

People with an interest in the unusual geology of karst may want to join the National Speleological Society. The organization focuses on cave conservation and the study of caves and karst features. It produces an excellent monthly magazine, the NSS News, and a quarterly publication, the Journal of Cave and Karst Studies. Write to National Speleological Society, 2813 Cave Avenue, Huntsville AL 35810-4431 or visit their web site at www.caves.org