20th century 10,837
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19th century 5,184
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21st century 2,761
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18th century 1,579
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1564-1616 1,017
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Civil War, 1861-1865 982
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17th century 973
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1945- 879
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Cretaceous 838
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1945-1989 733
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16th century 592
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1933-1945 547
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Revolution, 1775-1783 515
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1946- 499
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1989- 485
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Tertiary 446
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To 1500 445
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Quaternary 415
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2009- 410
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2001-2009 389
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Early modern, 1500-1700 386
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Colonial period, ca. 1600-1775 371
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1991- 351
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Precambrian 346
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Paleozoic 335
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Cenozoic 294
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1960- 280
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1951- 272
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2000- 261
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1929 249
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Permian 249
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1809-1865 237
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Eocene 235
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1993-2001 223
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Jurassic 223
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1918-1945 217
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Mesozoic 216
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1981-2001 214
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1949- 209
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Pennsylvanian 206
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Miocene 201
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Pleistocene 194
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1948- 192
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Ordovician 191
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1947- 189
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1961-1970 189
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Devonian 174
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1979- 171
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1991-2000 168
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1950- 167
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1945-1953 166
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1608-1674 165
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1882-1945 165
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-1400 164
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Mississippian 164
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1917-1963 163
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1952- 163
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1980- 163
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1882-1941 160
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1990- 154
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1969- 152
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1970- 150
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1783-1865 148
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1953-1961 148
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Triassic 148
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1965- 144
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1959- 142
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1812-1870 137
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1954- 136
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1981-1989 136
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Civil War, 2011- 136
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2001- 133
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Middle English, 1100-1500 132
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1993- 130
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1866-1895 127
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1724-1804 126
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1956- 125
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1913-1994 124
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To 1775 124
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1897-1962 123
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Cambrian 123
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1951-1960 120
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1958- 120
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1819-1891 119
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2003- 119
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World War, 1939-1945 119
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1775-1865 117
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1975- 116
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1997- 116
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1775-1783 115
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Holocene 115
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Pliocene 115
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1942- 114
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1961- 114
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1743-1826 113
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1941- 112
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1960-1980 112
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1843-1916 110
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1944- 110
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1964- 110
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