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Submitted on: 25 April 2002.
Revised on: 18 May 2002.
Accepted on: 09 June 2002.
___________________EXPLORATIONS IN ECONOMIC HISTORY
Submitted on: 22 February 2008.
Revised on: 21 May 2008.
Accepted on: 10 July 2008.
___________________EXPLORATIONS IN ECONOMIC HISTORY
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http://reply.papertrans.cn/1/96/9588/9588-35.png
Submitted on: 28 February 2014.
Revised on: 29 April 2014.
Accepted on: 06 June 2014.
___________________EXPLORATIONS IN ECONOMIC HISTORY