Submitted on: 29 December 1999.
Revised on: 26 March 2000.
Accepted on: 26 April 2000.
___________________ENVIRONMENTAL & ENGINEERING GEOSCIENCE
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Submitted on: 30 October 2006.
Revised on: 20 February 2007.
Accepted on: 05 April 2007.
___________________ENVIRONMENTAL & ENGINEERING GEOSCIENCE
Submitted on: 07 February 2006.
Revised on: 26 March 2006.
Accepted on: 24 April 2006.
___________________ENVIRONMENTAL & ENGINEERING GEOSCIENCE
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