61
by Landis, Lincoln
Published 1973
62
by Lenczowski, George
Published 1949
63
64
by Brandt, Willy
Published 1969
65
by Wriston, Henry M.
Published 1956
66
67
Published 1969
68
by Singadilaga,Dudy.
Published 1973
69
by Bailey, Thomas Adrew, 1902-
Published 1958
70
by Grant, Bruce, 1925-
Published 1978
71
by Pluvier, Jan M.
Published 1965
72
73
Published 1987
74
by Halle, Louis Joseph, 1910-
Published 1959
75
Published 1966
76
Published 1963
77
by Barghoorn, Frederick
Published 1964
78
by Halperin, Morton H.
Published 1965
79
Published 1956
80
by Brecher, Michael
Published 1972