Submitted on: 28 December 1998.
Revised on: 25 April 1999.
Accepted on: 15 May 1999.
___________________JOURNAL OF GLACIOLOGY---CAMBRIDGE UNIV PRESS
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Submitted on: 04 November 2008.
Revised on: 25 November 2008.
Accepted on: 12 December 2008.
___________________JOURNAL OF GLACIOLOGY---CAMBRIDGE UNIV PRESS
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Submitted on: 21 January 2007.
Revised on: 21 April 2007.
Accepted on: 16 June 2007.
___________________JOURNAL OF GLACIOLOGY---CAMBRIDGE UNIV PRESS
Submitted on: 10 September 2003.
Revised on: 30 December 2003.
Accepted on: 23 February 2004.
___________________JOURNAL OF GLACIOLOGY---CAMBRIDGE UNIV PRESS