21
by Dawkins, Richard, 1941-
Published 1983
22
Published 2008
23
by Mohammad Ilyas
Published 2003
24
by Wiesner, Jerome B.
Published 1965
25
by Lasker, Gabriel Ward
Published 1961
26
27
by Khairuddin Hj. Kamaruddin
Published 1999
28
29
Published 1974
30
31
by Johanson, Don
Published 1994
32
by Johanson, Don
Published 1994
33
by Johanson, Don
Published 1994
34
by Higham, Charles
Published 2002
35
Published 1995
36
37
by Hyung-Sup, Choi
Published 1990
38
Published 1994
39
by Pimm, Stuart L
Published 1991
40
by Hawking, Stephen W.
Published 1988