Era
20th century
28
1945-
13
1989-
7
1925-
6
1945-1989
6
21st century
5
1970-
4
1989 -
4
Biography
4
1956
3
1989
3
1901-1910
2
1948-1994
2
1973-
2
1976-
2
1985-
2
1985-1991
2
1985-1995
2
19th century
2
19th century --
2
History
2
1268-1492
1
1469-1527
1
1492-1559
1
1603-1649
1
17th century
1
17th century --
1
1808-1877
1
1837-1901
1
1849-1870
1
1858-1919
1
1865-1939
1
1870-1914
1
1874-1965
1
1878-1916 --
1
1884-1962
1
1895-1962
1
1903-1990
1
1908-1972
1
1910-1921
1
1914-1940
1
1914-1945
1
1915-1973
1
1918-
1
1918-1945
1
1923-
1
1925
1
1925-1965
1
1927-
1
1931-
1
more ...