F. Spencer
发表
Floyd Spencer,
Floyd Spencer,
F. Spencer,
1993
.
Floyd W. Spencer,
Kathleen V. Diegert,
Robert G. Easterling,
1991
.
Floyd W. Spencer,
F. Spencer,
1988
.
Floyd W. Spencer,
Jan Drewes Achenbach,
John Aldrin,
2001
.