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Submitted on: 26 December 2006.
Revised on: 11 March 2007.
Accepted on: 01 April 2007.
___________________INTERNATIONAL JOURNAL OF SPELEOLOGY
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Submitted on: 07 March 2006.
Revised on: 02 April 2006.
Accepted on: 23 May 2006.
___________________INTERNATIONAL JOURNAL OF SPELEOLOGY