41
by Cromwell
Published 1994
42
by Asher
Published 1983
43
by Bailey
Published 1994
44
by Henkel
Published 1976
45
by Benfer
Published 1991
46
by Jacob
Published 1984
47
by Berry
Published 1984
48
by Zagare
Published 1984
49
by Mckewn
Published 1988
50
by Menard
Published 1991
51
by Hildebrand
Published 1977
52
by Levine
Published 1977
53
by Langbein
Published 1978
54
by Knoke
Published 1982
55
by Weber
Published 1990
56
by Markus
Published 1979
57
by Aldenderfer
Published 1984
58
by Mahajan
Published 1985
59
by Hartwig
Published 1979
60
by Madron
Published 1985