| Author | Titles | | 1.
| Ó Faolain, Simon | 1 | | 2.
| O., G., 1915-1992 | 0 | | 3.
| Author is: Ottolini, Guida | 5 | | 4.
| O gata pseud. | 0 | | 5.
| Author is: Furtado, José de Almeida, 1778-1831 | 2 | | 6.
| O' Hehir, Anne | 1 | | 7.
| Ó, João, 1977- | 1 | | 8.
| Ó, Jorge do, 1962- | 0 | | 9.
| Author is: Ó, Jorge Ramos do, 1962- | 6 | | 10.
| Ó, Jorge Manuel Nunes Ramos do, 1962- | 0 | | 11.
| Author is: Ó, Jorge Ramos do, 1962- | 6 | | 12.
| Ó, Jorge Ramos do, 1962- | 6 | | 13.
| O' Laughlin, Bridget | 1 | | 14.
| O' Malley, John W. | 1 |
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