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Submitted on: 25 September 2015.
Revised on: 29 October 2015.
Accepted on: 24 December 2015.
___________________Geography and Natural Resources
Submitted on: 30 August 2014.
Revised on: 06 November 2014.
Accepted on: 27 December 2014.
___________________Geography and Natural Resources
Submitted on: 10 October 2011.
Revised on: 22 November 2011.
Accepted on: 09 January 2012.
___________________Geography and Natural Resources
Submitted on: 08 June 2015.
Revised on: 22 September 2015.
Accepted on: 23 October 2015.
___________________Geography and Natural Resources
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