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| O’Brien (Destroyer : DD-415) #0377 |
| O’Hagan, Charles J., b. 1821 #0423 |
| O’Reilly, John Boyle, 1844-1890 #0458 |
| Oak Ridge Institute #0489 |
| Oak Ridge Military Academy—Students—Social life and customs #0025 |
| Oaksmith, Appleton, 1827-1887 (2 collections) |
| O'Connell, James T. #0166 |
| Ocracoke Island (N.C.)—History—19th century #0001 |
| Ocracoke Island (N.C.)—Photographs #1112 |
| Officers' spouses—England—London #0511 |
| Officers' spouses—North Carolina—New Bern #0511 |
| Oglala (Ship) #0194 |
| O'Hara, James E. (James Edward), 1844-1905 #0115 |
| O'Hare (Destroyer : DD-889) #0548 |
| Ohio River Valley—History—Civil War, 1861-1865 #0164 |
| Ohio—Politics and government—20th century #0149 |
| Olds, Fred A.—Correspondence #0133 |
| O'Neal Foundation #0020 |
| O'Neal, William Benjamin #0020 |
| Onslow County (N.C.)—Maps #0178 |
| Operation Flintlock, 1944 #0321 |
| Operation Sail, 1976 #0376 |
| Opium abuse—China #0280 |
| Orange County (N.C.)—Genealogy #0116 |
| Orange County (N.C.)—History #0116 |
| Orange County (Va.)—History, Military—19th century (2 collections) |
| Oregon territory—Geography #0308 |
| Oregon territory—History #0308 |
| Oregon territory—Social life and customs #0308 |
| Ormond, James—Diaries #0792 |
| Oroville (Calif.)—Description and travel #0781 |
| Orphans—North Carolina #0031 |
| Orr, William M. #0156 |
| Osborn, William H. (William Henry), 1856-1921 #0041 |
| O'Toole, Ruth, b. 1899 #0258 |
| Outer Banks (N.C.)—Photographs #1112 |
| Owen, Ruth Bryan, 1885-1954 #0021 |
