21
by Neher, Clark D.
Published 1991
22
23
24
by Bird, Graham
Published 1991
25
by Robison, Richard, 1943-
Published 1990
26
by Fuchs, Victor R.
Published 1983
27
by Mishan, E. J., 1917-
Published 1969
28
29
Published 2001
30
by Toffler,Alvin.
Published 1970
31
by MacIntyre, Andrew J., 1960-
Published 1991
32
by Rohwer, Jim.
Published 1995
33
34
35
by Young, John W., 1957-
Published 1991
36
37
38
by Dunung, Sanjyot P.
Published 1995
39
40