41
by Almond
Published 1989
42
by Swidler
Published 1990
43
by Southern, 1912-
Published 1978
44
45
by Oddie, 1932-
Published 1991
46
by Kelly, 1933-
Published 1992
47
by Brockington
Published 1992
48
by Yao
Published 1996
49
by Shorter
Published 1988
50
by Fraser
Published 1992
51
52
by Ilyas Harun
Published 2001
53
Published 1991
54
Published 2004
55
56
by Goddard
Published 1995
57
58
by Watt
Published 1991
59
by Goddard
Published 1996
60
by Lazarus-Yafeh
Published 1992