1
Published 1989
2
by Roberts, Brad
Published 1996
3
Published 2002
4
by Pearson, Frederic C.
Published 1994
5
Published 1992
6
Published 1990
7
Published 1991
8
by Sagan, Scott D
Published 1995
9
10
Published 1984
11
Published 1996
12
13
Published 1997
14
Published 1993