| Author | Titles | 1.
| Oliveira, Virgílio de, 1901-1967 | 1 | 2.
| Oliveira, Viriato Gomes de | 1 | 3.
| Oliveira, Vitória Gabardo de | 1 | 4.
| Oliveira, Weber de | 2 | 5.
| Oliveira, Zacarias de | 3 | 6.
| Olivella, Eduardo | 1 | 7.
| Olivenza | 1 | 8.
| Oliver, Alberto | 1 | 9.
| Oliver, Anthony | 1 | 10.
| Oliver, Celia Y. | 1 |
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