41
by Schellenberg
Published 1968
42
by Schellenberg
Published 1965
43
by Schellenberg
Published 1965
44
Published 1966
45
by Arad.A
Published 1981
46
Published 1978
47
Published 1993
48
by Henchy
Published 1998
49
by Verhoeven
Published 1966
50
51
by Foster
Published 1989
52
by Cook
Published 1980
53
by Muller
Published 1968
54
by Posner
Published 1964
55
by Cook
Published 1986
56
57
58
59
Published 1987
60
Published 1999