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Submitted on: 04 July 2019.
Revised on: 21 October 2019.
Accepted on: 09 November 2019.
___________________AGRICULTURAL HISTORY---DUKE UNIV PRESS
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http://reply.papertrans.cn/1/11/1001/1001-24.png
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Submitted on: 29 August 2014.
Revised on: 12 November 2014.
Accepted on: 06 December 2014.
___________________AGRICULTURAL HISTORY---DUKE UNIV PRESS
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http://reply.papertrans.cn/1/11/1001/1001-28.png
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Submitted on: 12 November 2000.
Revised on: 21 December 2000.
Accepted on: 14 January 2001.
___________________AGRICULTURAL HISTORY---DUKE UNIV PRESS