20th century 6,522
View Records
19th century 3,213
View Records
21st century 1,750
View Records
18th century 1,104
View Records
Civil War, 1861-1865 985
View Records
1945- 795
View Records
Cretaceous 792
View Records
1945-1989 650
View Records
17th century 643
View Records
1933-1945 539
View Records
Revolution, 1775-1783 516
View Records
1989- 435
View Records
16th century 432
View Records
Tertiary 430
View Records
2009- 410
View Records
1946- 401
View Records
2001-2009 389
View Records
Quaternary 363
View Records
1991- 350
View Records
Colonial period, ca. 1600-1775 347
View Records
To 1500 325
View Records
Paleozoic 309
View Records
Precambrian 304
View Records
Cenozoic 279
View Records
2000- 261
View Records
Permian 237
View Records
1960- 223
View Records
1993-2001 223
View Records
Eocene 223
View Records
1918-1945 219
View Records
1981-2001 218
View Records
1564-1616 214
View Records
Jurassic 206
View Records
Miocene 199
View Records
Pennsylvanian 199
View Records
Mesozoic 196
View Records
1951- 191
View Records
1929 186
View Records
Ordovician 179
View Records
Pleistocene 172
View Records
1945-1953 167
View Records
Mississippian 163
View Records
Devonian 160
View Records
1979- 159
View Records
1949- 157
View Records
1980- 156
View Records
1809-1865 152
View Records
1783-1865 148
View Records
1953-1961 148
View Records
Triassic 140
View Records
1990- 137
View Records
1981-1989 136
View Records
Civil War, 2011- 136
View Records
1882-1945 134
View Records
2001- 133
View Records
Early modern, 1500-1700 133
View Records
1993- 127
View Records
To 1775 124
View Records
1947- 123
View Records
1775-1865 117
View Records
2003- 117
View Records
1997- 116
View Records
1775-1783 115
View Records
1960-1980 112
View Records
Revolution, 1789-1799 110
View Records
Cambrian 109
View Records
Pliocene 108
View Records
1969-1974 104
View Records
Holocene 103
View Records
World War, 1939-1945 102
View Records
1980-2020 101
View Records
1969- 100
View Records
1913-1994 98
View Records
1970- 98
View Records
Oligocene 98
View Records
To 146 B.C. 98
View Records
To 1846 97
View Records
Proterozoic 96
View Records
1917-1963 95
View Records
1952- 94
View Records
1976-2002 94
View Records
1975- 93
View Records
1981-1993 92
View Records
1865-1918 91
View Records
1988- 91
View Records
2016 91
View Records
Carboniferous 91
View Records
To 1848 90
View Records
War of 1812 90
View Records
1949-1976 89
View Records
1963-1969 87
View Records
1948- 86
View Records
1959-1990 86
View Records
1965- 85
View Records
Silurian 85
View Records
1815-1861 84
View Records
2002- 83
View Records
1858-1919 82
View Records
1889-1945 82
View Records
1986- 80
View Records
United States 389
Iraq 11
Great Britain 4
China 3
Islamic countries 3
Israel 3
Latin America 3
Afghanistan 2
Arab countries 2
Australia 2
East Asia 2
Asia, Eastern 1
Bosnia and Herzegovina 1
Burma 1
Canada 1
Central America 1
Colorado 1
Developing countries 1
Dominican Republic 1
European Union countries 1
Georgia 1
Haiti 1
Kansas 1
Korea (South) 1
Middle East 1
Morocco 1
Nevada 1
New York (N.Y.) 1
Oman 1
Russia (Federation) 1
South Asia 1
Southeast Asia 1
Southern States 1
Srebrenica 1
Srebrenica (Bosnia and Herzegovina) 1
Vermont 1