| Author | Titles | 1.
| Ormesson, Jean d' | 1 | 2.
| Ormezzano, Mario Francisco | 1 | 3.
| Ormiston, James | 7 | 4.
| Ormond, Richard | 10 | 5.
| Ormonde, Helena | 6 | 6.
| Ormrod, John | 8 | 7.
| Orna, Elizabeth | 1 | 8.
| Ornaghi, Lorenzo | 2 | 9.
| Ornamental Pheasant Society (Grã-Bretanha) | 2 | 10.
| Ornano, Conde de, 1784-1863 | 1 |
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