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Subject (Era)
- 19th century157
- 20th century141
- 18th century44
- 17th century37
- 21st century25
- 16th century22
- 1900-199915
- Civil War, 1861-186514
- Colonial period, ca. 1600-177511
- Early modern, 1500-170011
- 15th century10
- 1945-10
- To 150010
- 500-14008
- 1933-19457
- 1961-19707
- Early modern and Elizabethan, 1500-16007
- To 221 B.C.7
- 1900-20996
- 1971-19806