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Subject (Era)
- 20th century188,398
- 19th century88,773
- 21st century56,472
- 18th century41,527
- 17th century40,541
- Civil War, 1861-186523,020
- 1945-18,121
- Revolution, 1775-178314,091
- 1900-199913,386
- Civil War, 1642-164913,061
- 16th century11,331
- To 15008,692
- Colonial period, ca. 1600-17758,261
- 1989-8,144
- 2000-20997,205
- 1945-19896,492
- 1933-19455,592
- Early modern, 1500-17005,433
- 1775-18655,271
- 1960-5,153