Era
20th century
9
United States
9
20th century --
5
1981-
4
1981-1993
3
1945-
2
1960-1980
2
1971-1981
2
1980-
2
1989-
2
20th century. --
2
1775 - 1783
1
1783 - 1789
1
17th century
1
1861-1865
1
18th century
1
1904-
1
1924-
1
1929 --
1
1933-40
1
1937-1979
1
1943-
1
1945
1
1945 - 1970
1
1945-1989
1
1949-
1
1953-1961
1
1956-
1
1960-
1
1961-1971
1
1969-
1
1969-1974 - Congresses
1
1971-1980- History and criticism
1
1971-1990
1
1975
1
1979-
1
1981
1
1981-1990 - History and criticism
1
1985-1995
1
1993-
1
20th Century --
1
21st century --
1
Cases
1
Colonial period, ca. 1600 - 1775
1
Conduct of life
1
France
1
History - 20th century
1
History - 20th century - Congresses
1
Iran
1
New York
1
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