Era
1970-
46
1960-
41
Since 1970
18
1984-1993
13
Since 1960
13
1984-
11
1993-2007
5
1960-1975
4
1993-
4
20th century
4
1979-1983
3
21st century
3
1967-1970
2
1984 - 1993
2
2000-2099
2
Civil War, 1967-1970
2
-1981
1
1900 - 1999
1
1900-1999
1
1909-1987
1
1944-1981
1
1960-1993
1
1960-2007
1
1967 - 1970
1
1979 - 1983
1
1979-
1
Congresses
1
Cretaceous
1
Paleogene
1
Since 1900
1