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Subject (Era)
- 20th century13,862
- 19th century5,631
- 1989-4,445
- 18th century4,271
- 1945-3,963
- 21st century3,501
- 17th century2,949
- 1918-19452,595
- To 15002,346
- 16th century2,049
- 476-14921,820
- 1789-18151,701
- 1871-19181,671
- 1789-19001,649
- 1900-19991,108
- 1945-1989926
- 1991-884
- Middle Ages, 600-1500882
- 1648-1789871
- 1517-1648829