21
by Hauss, Charles
Published 1996
22
Published 2001
23
24
by Schultz, Kenneth A.
Published 2001
25
Published 1999
26
by Rosenau, James N.
Published 1990
27
28
29
Published 1990
30
31
Published 1994
32
Published 1992
33
by Mayall, James
Published 1990
34
Published 1992
35
Published 1995
36
Published 2006
37
by George, Alexander L.
Published 2006
38
by Mitchell, John
Published 1996
39
by Youngs, Richard, 1968-
Published 2006
40
Published 2000