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Submitted on: 25 May 2007.
Revised on: 15 July 2007.
Accepted on: 26 July 2007.
___________________GEOSYNTHETICS INTERNATIONAL---EMERALD GROUP PUBLISHING LTD
Submitted on: 29 September 2007.
Revised on: 02 December 2007.
Accepted on: 25 December 2007.
___________________GEOSYNTHETICS INTERNATIONAL---EMERALD GROUP PUBLISHING LTD
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