| Author | Titles | | 1.
| O'Reilly, Paul M. | 7 | | 2.
| O'Reilly, Sally, 1971- | 4 | | 3.
| O'reilly, Sally Jane, 1971- | 0 | | 4.
| Author is: O'Reilly, Sally, 1971- | 4 | | 5.
| O'Reilly, Yves | 1 | | 6.
| O'Rell, Max | 1 | | 7.
| O'Rell, Max, pseud. | 2 | | 8.
| Orellana Escudero, Gerardo | 1 | | 9.
| Orellana, Gaston, 1933- | 3 | | 10.
| Orellana, Gastón, 1933- | 1 | | 11.
| Oren, Ann, 1979- | 1 |
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