- Alexander, E. Calvin, Jr., ed., "An Introduction to the Caves of Minnesota, Iowa, and Wisconsin,"         
   Guidebook for the 1980 National Speological Society Convention, 1980.

- Anonymous, "So you want to be a spelunker!" reprinted from Nittany Grotto News, VII, 2, October 1958.

- Hondo Underground Rescue Team, "Rules for Safe Caving," National Speleological Society Caving 
    Information Series.

- Pittsburgh Grotto, "Information for Neophyte Cavers," National Speleological Society Caving Information