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Submitted on: 07 July 2004.
Revised on: 26 July 2004.
Accepted on: 03 August 2004.
QUATERNARY INTERNATIONAL
Submitted on: 02 November 2005.
Revised on: 14 December 2005.
Accepted on: 30 December 2005.
QUATERNARY INTERNATIONAL---PERGAMON-ELSEVIER SCIENCE LTD