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Subject (Era)
- 20th century27,199
- 19th century9,376
- 1933-19457,694
- 18th century4,395
- 1918-19333,813
- 1990-3,224
- 21st century2,717
- 1945-19902,102
- 1871-19181,867
- 17th century1,664
- 16th century1,612
- 1945-1,590
- 1918-19451,512
- Unification, 19901,406
- 1900-19991,259
- 1789-19001,168
- 1945-1955939
- Revolution, 1848-1849752
- 1888-1918667
- 1871-659