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Time Period (Topic)
- 20th century135
- 1980s (1980-1989)71
- 1970s (1970-1979)58
- 2010s (2010-2019)38
- 2000s (2000-2009)36
- 1990s (1990-1999)30
- 19th century12
- 1960s (1960-1969)10
- 18th century7
- 1950s (1950-1959)7
- civilization, ancient7
- 16th century6
- 15th century5
- 17th century5
- 1930s (1930-1939)4
- 1940s (1940-1949)2
- 1st century2
- 13th century1
- 14th century1
- 1840s (1840-1849)1