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Subject (Era)
- 20th century158,553
- 19th century51,415
- 21st century43,219
- 18th century24,570
- 17th century16,677
- To 15009,998
- 1945-9,577
- 16th century9,438
- 1900-19999,397
- 2000-20998,043
- Revolution, 1789-17997,416
- Civil War, 1861-18656,447
- Revolution, 1775-17835,852
- 1991-5,067
- 1989-4,965
- 1933-19453,601
- 1960-3,020
- 1918-19452,948
- Early modern, 1500-17002,915
- 1990-2,914