Submitted on: 08 December 1999.
Revised on: 31 January 2000.
Accepted on: 22 February 2000.
___________________JOURNAL OF GLACIOLOGY---CAMBRIDGE UNIV PRESS
Submitted on: 12 August 2000.
Revised on: 01 November 2000.
Accepted on: 19 December 2000.
___________________JOURNAL OF GLACIOLOGY---CAMBRIDGE UNIV PRESS
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Submitted on: 17 April 2008.
Revised on: 07 August 2008.
Accepted on: 23 September 2008.
___________________JOURNAL OF GLACIOLOGY---CAMBRIDGE UNIV PRESS
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Submitted on: 19 January 2007.
Revised on: 12 May 2007.
Accepted on: 02 June 2007.
___________________JOURNAL OF GLACIOLOGY---CAMBRIDGE UNIV PRESS