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Subject (Era)
- 20th century43,122
- 19th century21,099
- 21st century15,145
- 18th century7,515
- 1945-6,881
- 17th century3,473
- 1900-19993,006
- 1933-19452,912
- 1980-2,371
- 1991-2,199
- To 15002,069
- 2000-20992,021
- 16th century1,965
- 1989-1,649
- 1800-18991,483
- 1960-1,450
- 1918-19451,439
- 1970-1,426
- 1975-1,381
- Civil War, 1861-18651,308