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Subject (Era)
- 1945-2,202
- 21st century2,108
- 20th century1,982
- 1989-1,041
- Cretaceous639
- 1960-638
- Quaternary614
- 1991-584
- 1918-486
- 1945-1989431
- 19th century431
- Tertiary401
- Paleozoic387
- 2000-2099332
- Pleistocene325
- 1980-315
- 1976-305
- 2009-299
- Precambrian299
- 2000-296