Submitted on: 06 October 2008.
Revised on: 18 January 2009.
Accepted on: 26 February 2009.
___________________Bulletin of Geography-Physical Geography Series
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Submitted on: 19 June 2006.
Revised on: 11 August 2006.
Accepted on: 02 October 2006.
___________________Bulletin of Geography-Physical Geography Series
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Submitted on: 24 October 2008.
Revised on: 20 November 2008.
Accepted on: 01 December 2008.
___________________Bulletin of Geography-Physical Geography Series
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Submitted on: 15 March 2007.
Revised on: 26 May 2007.
Accepted on: 21 July 2007.
___________________Bulletin of Geography-Physical Geography Series
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