41
Published 1989
42
Published 1981
43
by Abraham, L. A.
Published 1964
44
Published 1989
45
Published 1995
46
by Spears, Richard A.
Published 1991
47
Published 1993
48
by Butler, Audrey
Published 1964
49
by Capie, David, 1968 -
Published 2002
50
by Lowes, David E, 1962-
Published 2006
51
Published 2007
52
by Fowler, H. W.
Published 1983
53
Published 1991
54
Published 1992
55
Published 1994
56
Published 1991
57
Published 1993
58
by Medlik, S, 1928-
Published 2003
59
Published 1994
60
Published 1991