Era
Early works to 1800
2,125
18th century
698
19th century
255
17th century
209
Quaternary
117
20th century
107
-527
84
16th century
73
From 2 million years ago
72
1900-1999
52
Holocene
48
1648-1794
45
1714-1795
45
1870-1945
45
1945-
44
1870-
43
21st century
40
To 1500
35
Pleistocene
34
From 10 thousand years ago
29
1749-1832
28
Since 1870
24
Cretaceous
23
From 10 thousand to 2 million years ago
21
1800-1899
20
1800-1870
19
2000-2099
19
Qing dynasty, 1644-1912
17
Since 1945
16
Tertiary
16
1965-1974
12
Paleozoic
12
d.527
11
Cenozoic
10
Ming dynasty, 1368-1644
10
1644-1912
9
1700-1799
9
1900 - 1999
9
From 2 to 65 million years ago
9
Geschichte
9
Mesozoic
9
20e siècle
8
Ordovician
8
Song dynasty, 960-1279
8
1368-1912
7
1965 - 1974
7
Cambrian
7
Han dynasty, 202 B.C.-220 A.D
7
Tang dynasty, 618-907
7
1452-1519
6
more ...