United States 16,281
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Great Britain 2,671
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China 1,309
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England 1,279
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Europe 1,244
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France 1,211
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Germany 1,023
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Colorado 774
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California 754
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Soviet Union 754
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West (U.S.) 634
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Japan 541
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India 527
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Italy 522
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Mexico 478
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New York (State) 456
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Texas 408
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Southern States 394
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Spain 394
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Rome 388
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Russia (Federation) 363
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Middle East 357
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Russia 334
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Wyoming 317
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Alaska 313
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New Mexico 309
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Utah 308
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Greece 286
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Washington (D.C.) 276
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Latin America 267
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Iraq 264
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New York 260
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Montana 248
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Nevada 248
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Arizona 226
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Afghanistan 225
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Cuba 223
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Massachusetts 211
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Egypt 207
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Africa 205
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Virginia 199
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North America 197
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Ireland 192
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Canada 174
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Kansas 174
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America 169
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Southwest, New 166
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Europe, Eastern 163
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Austria 159
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Syria 158
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Iran 152
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Turkey 152
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Pennsylvania 147
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Israel 146
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Idaho 142
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New England 137
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Illinois 136
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Louisiana 135
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New York (N.Y.) 132
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Netherlands 125
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Poland 125
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London 122
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Haiti 117
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Vietnam 117
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Kentucky 114
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Asia 111
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Missouri 109
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Scotland 109
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South Africa 109
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Mississippi 104
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Georgia 103
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Washington (State) 102
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Oregon 101
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London (England) 99
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Michigan 99
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Ukraine 99
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Brazil 96
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Confederate States of America 95
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Palestine 94
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South Carolina 92
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Paris (France) 89
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North Carolina 88
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Paris 86
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Alabama 85
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Florida 85
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Burma 83
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Pakistan 83
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Philippines 82
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Sudan 81
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Oklahoma 77
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Peru 77
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Wisconsin 77
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New Jersey 76
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Maryland 75
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Puerto Rico 72
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Developing countries 70
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European Union countries 70
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Ohio 69
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Libya 68
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Argentina 67
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Ordovician 35
Mississippian 16
1809-1865 10
Pennsylvanian 9
Civil War, 1861-1865 7
Devonian 5
To 1792 5
1734-1820 4
20th century 3
Silurian 3
1906-1984 2
19th century 2
Cambrian 2
Pleistocene 2
Quaternary 2
1743-1826 1
1774-1844 1
1777-1852 1
1792-1865 1
1815-1854 1
18th century 1
1900-1986 1
1905-1989 1
1906-1997 1
1909-1994 1
1924-2015 1
1929 1
1979 1
Carboniferous 1
Colonial period, ca. 1600-1775 1
Cretaceous 1
Eocene 1
Paleozoic 1
Tertiary 1
To 1795 1