Submitted on: 15 April 1999.
Revised on: 27 June 1999.
Accepted on: 13 July 1999.
___________________Geographia Technica---GEOGRAPHIA TECHNICA ASSOC - GT ASSOC
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Submitted on: 13 December 2006.
Revised on: 29 March 2007.
Accepted on: 10 May 2007.
___________________Geographia Technica---GEOGRAPHIA TECHNICA ASSOC - GT ASSOC
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Submitted on: 28 July 2006.
Revised on: 29 October 2006.
Accepted on: 26 November 2006.
___________________Geographia Technica---GEOGRAPHIA TECHNICA ASSOC - GT ASSOC
Submitted on: 28 August 2000.
Revised on: 22 November 2000.
Accepted on: 19 January 2001.
___________________Geographia Technica---GEOGRAPHIA TECHNICA ASSOC - GT ASSOC