http://reply.papertrans.cn/1/10/999/999-21.png
http://reply.papertrans.cn/1/10/999/999-22.png
http://reply.papertrans.cn/1/10/999/999-23.png
http://reply.papertrans.cn/1/10/999/999-24.png
Submitted on: 09 December 2004.
Revised on: 25 February 2005.
Accepted on: 18 March 2005.
___________________AGRICULTURAL HISTORY---DUKE UNIV PRESS
http://reply.papertrans.cn/1/10/999/999-26.png
http://reply.papertrans.cn/1/10/999/999-27.png
Submitted on: 30 April 2010.
Revised on: 02 August 2010.
Accepted on: 24 August 2010.
___________________AGRICULTURAL HISTORY---DUKE UNIV PRESS
Submitted on: 22 August 2004.
Revised on: 13 October 2004.
Accepted on: 04 December 2004.
___________________AGRICULTURAL HISTORY---DUKE UNIV PRESS
Submitted on: 06 April 2005.
Revised on: 07 May 2005.
Accepted on: 22 May 2005.
___________________AGRICULTURAL HISTORY---DUKE UNIV PRESS