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Subject (Era)
- 1991-1,014
- 20th century760
- 19th century438
- 21st century421
- 1801-1917193
- 1945-148
- 18th century126
- Revolution, 1917-1921107
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- 1917-70
- 1917-197068
- Since 199161
- 1970-57
- 1970-199156
- 1953-198555
- 1894-191749
- 1985-199148