| Description | Bill O'Brien (1 item), Conor O'Brien (1 item), Darcy O'Brien (2 items), E.D. O'Brien (1 item), John O'Brien (7 items), Stephen B. O'Brien (1 item), Sybil O'Brien (1 item), Sean O'Casey (2 items), Marvin R. O'Connell (University of Notre Dame, Indiana) (1 item), Ulick O'Connor (1 item), E.J. O'Donnell (3 items), Nellie O'Farrell (63 items), Edward G. O'Ferrall (1 item), Seamus D. O'Hea (1 item), Mabel O'King (1 item), Noelle O'Reilly (Literary & Historical Society, University College, Belfast) (1 item),Sean O'Sullivan (1 item), Timothy O'Sullivan (2 items), Walter Oakeshott (Rector, Lincoln College, Oxford) (2 items), Arthur Oates (1 item), Peg & Jack Oates (4 items), Thomas R. Oates (Saint Michael's College, Winooski, Vermont) (1 item), Stanley Oatway (1 item), William H. Oblad (1 item), C.M. Odorizzi (1 item), C.K. Ogden (2 items), David Ogg (6 items), Isamu Ohashi (1 item), Captain & Gladys Oko (4 items), Barney Oldfield (1 item), J.L. Oliver (1 item), W.H. Oliver (1 item), Laurence Olivier (1 item), Richard (and Mary) Ollard (70 items), Robert F. Olson (1 item), Carola Oman, CC Oman, Charles, Sir Oman, Helen D. Oman (1 item), Julia Trevelyan Oman (4 items), Jacqueline Kennedy Onassis (To be counted), Ralph Oppenheim (1 item), Robert Oppenheimer (2 items), G.R. Orchard (1 item), Leslie C.J. Orchard (1 item), Judy Oringer (Clarkson N. Potter Publishers) (1 item), Nicholas Orme (10 items), Guillaume Ormond (2 items), F.L. Ormsby (1 item), Constance Osborn (6 items), J.M. Osborn, Charles Osborne (13 items), Noel Osborne (Phillimore & Co Publishers Ltd) (3 items), Murielle Otter (1 item), George W. Otrin (1 item), Laurel Overman (1 item), T.A. Owen (1 item), James Oxley (1 item), John Oxley (5 items)
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