21st century 42
1981-2001 20
20th century 16
1945- 8
2001-2009 6
1990- 4
1960- 3
1965- 3
1971-1981 3
19th century 3
2000- 3
2009- 3
World War, 1939-1945 3
1918-1945 2
1971-1990 2
1980-2020 2
2016 2
Civil War, 1861-1865 2
1796-1872 1
1869-1934 1
1910-1945 1
1930-2019 1
1934- 1
1945-1989 1
1946- 1
1949- 1
1966- 1
1976-2000 1
1989-1993 1
1991- 1
1992 1
2002- 1
2008 1
2012 1
Appropriations and expenditures, 2008-2013 1
Colonial period, ca. 1600-1775 1
Hasta 1775 1
Modern 1
Periodo colonial, ca. 1600 1775 1
Revolution, 1775-1783 1
Revolution, 1835-1836 1
Silurian 1
To 1775 1
To 1846 1
World War, 1914-1918 1