Era
19th century
2,554
20th century
1,885
18th century
1,405
17th century
921
Revolution, 1775-1783
724
Colonial period, ca. 1600-1775
595
15th century
569
16th century
500
1775-1865
478
14th century
358
-632
324
Civil War, 1861-1865
279
1775-1783
230
To 1775
218
1900-1999
208
13th century
195
21st century
153
1600-1775
147
12th century
125
1775 - 1783
118
1951-
112
1732-1799
107
1865-1950
96
1800-1899
94
1775 - 1865
88
1861-1865
83
1175-1249
79
-1355?
76
1600 - 1775
76
Early works to 1800
70
Revolution, 17751783
70
11th century
68
1900 - 1999
68
1923
65
1890
64
1899-1936
64
1930-1932
64
2000-2099
64
Cretaceous
63
1917
61
1322-1389?
59
1909
59
1700-1799
57
1896
55
1886
53
1910
53
1915
53
1924
53
1873
52
1905
48
more ...