January 23 1989
Ware, George
March 2 1989
Qingru, Zhao
March 9 1989
Carter, Joel W.
March 12 1989
Qiwen, Zhang
April 7 1989
April 17 1989
May 3 1989
May 5 1989
May 12 1989
May 26 1989
November 7 1989
September 14 1989
October 5 1989
November 15 1989
December 10 1987
January 27 1988
May 20 1990
July 5 1990
Hui, Zhang
August 3 1990