Era
1957-
6
21st century
6
1959-
4
1997-
4
To 1500
4
1945-
3
2000-2099
3
20th century
3
2000-
2
2009-
2
1800-1899
1
1900-1999
1
1946-
1
1951-
1
19th century
1
2001
1
2009-2017
1
Appropriations and expenditures, 2018
1
Appropriations and expenditures, 2019
1
Dhofar War, 1964-1976
1
Geschichte 1990-2007
1
Since 1900
1
Since 1945
1
Since 1951
1
Since 2009
1