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Subject
- Important bird areas3,188
- Wilderness areas3,188
- Trees2,823
- Old growth forests2,176
- Congaree National Park (S.C.)2,171
- United States--History--Civil War, 1861-18651,909
- Historic sites1,854
- Swamps1,368
- Moths1,301
- Biological specimens1,297
- Conservation and restoration1,169
- Fort Sumter National Monument (Agency : U.S.)1,124
- Plants1,118
- Archaeology 1,057
- African Americans--History--20th century1,046
- Fort Moultrie (S.C.)1,030
- Biosphere reserves1,012
- African Americans--Politics and government--South Carolina--History--20th century930
- African Americans--Education--Southern States908
- African Americans--Civil rights--History--20th century907