December 10 1987
Qingru, Zhao
January 27 1988
Ware, George
October 25 1988
November 30 1988
December 2 1988
December 27 1988
January 23 1989
March 2 1989
March 9 1989
Carter, Joel W.
April 7 1989
April 17 1989
May 2 1989
May 3 1989
May 5 1989
May 12 1989
May 26 1989
November 7 1989
August 23 1989
September 14 1989
October 5 1989
November 15 1989
March 8 1991
circa 1991
August 20 1991
October 21 1991
Qingru, Zhao , Ware, George
June 10 1992
July 19 1988
Qiwen, Zhang
August 2 1988
May 20 1990
July 5 1990
Hui, Zhang
August 3 1990
December 10 1990