http://reply.papertrans.cn/1/10/997/997-31.png
Submitted on: 15 October 2002.
Revised on: 22 November 2002.
Accepted on: 05 December 2002.
___________________AGRICULTURAL HISTORY---DUKE UNIV PRESS
http://reply.papertrans.cn/1/10/997/997-33.png
Submitted on: 08 February 2008.
Revised on: 09 April 2008.
Accepted on: 20 April 2008.
___________________AGRICULTURAL HISTORY---DUKE UNIV PRESS
http://reply.papertrans.cn/1/10/997/997-35.png
Submitted on: 22 December 1998.
Revised on: 23 February 1999.
Accepted on: 05 April 1999.
___________________AGRICULTURAL HISTORY---DUKE UNIV PRESS