Era
Early works to 1800
22
Revolution, 1775-1783
10
19th century
8
20th century
8
Civil War, 1861-1865
6
-632
5
18th century
5
To 1500
5
1871
4
1946-
4
17th century
3
1861-1865
3
1914-1918
3
1945-
3
1955-
3
1959-
3
Medieval period, 1066-1485
3
16th century
2
1704-1769
2
1741-1809
2
1775-1783 (Révolution)
2
1800-1899
2
1821-1882
2
1848-1892
2
1859-1916
2
1861-1865 (Guerre de Sécession)
2
1895-1974
2
1919-1952
2
1931-
2
1952-
2
1953-
2
1960-
2
1968-
2
1974-
2
2000-2099
2
21st century
2
Handbooks, manuals, etc
2
To 1172
2
To 794
2
-1645
1
-1659
1
-1870
1
-680
1
-approximately 669
1
1027 or 1028-1087
1
1200-1259
1
1237 - 1480
1
1237-1480
1
1302-1364?
1
1392-1910
1
more ...