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Subject (Era)
- 20th century2,837
- 1945-694
- 19th century419
- 1918-251
- 1918-1945247
- 1900-1999224
- 1910-1946183
- Civil War, 1861-1865134
- 1933-1945128
- 1945-1989116
- 1867-1910100
- Revolution, 1917-192183
- Revolution, 1775-178373
- Colonial period, ca. 1600-177571
- Civil War, 1936-193967
- 1800-189965
- 21st century65
- Revolution, 1905-190765
- 1960-63
- 1914-191862