References

Christoperson, R.W., 2003. Geosystems an introduction to physical geography: New Jersey, Pearson Education, Inc., 660 p.

Crystal Cave, 2005. About the cave [online]. Available from: http://cavern.com/crystalcave/about_us.htm [Accessed 30 November 2005].

Alpha, T.R., Galloway, J.P., Tinsley III, J.C., 2004, Karst topography - teacher's guide and paper model: U.S. Geological Survey Open-File Report 97-536A, Available from: http://wrgis.wr.usgs.gov/docs/parks/cave/karst.html [Accessed 5 December 2005].

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