| Author | Titles | 1.
| O'Reilly, Anthony J. F. | 1 | 2.
| O'Reilly, John | 2 | 3.
| O'Reilly, Patrick | 1 | 4.
| O'Reilly, Paul M. | 7 | 5.
| O'Reilly, Sally, 1971- | 4 | 6.
| O'reilly, Sally Jane, 1971- | 0 | 7.
| Author is: O'Reilly, Sally, 1971- | 4 | 8.
| O'Reilly, Yves | 1 | 9.
| O'Rell, Max | 1 | 10.
| O'Rell, Max, pseud. | 2 | 11.
| Orellana Escudero, Gerardo | 1 |
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