| Author | Titles | 1.
| Ordrupgaard | 1 | 2.
| Ore, Oretta Dalle | 1 | 3.
| Orebich, Giuseppe | 1 | 4.
| O'Regan, Rosalind | 1 | 5.
| O'Reilly, Anthony J. F. | 1 | 6.
| O'Reilly, John | 2 | 7.
| O'Reilly, Patrick | 1 | 8.
| O'Reilly, Paul M. | 7 | 9.
| O'Reilly, Sally, 1971- | 4 | 10.
| O'reilly, Sally Jane, 1971- | 0 | 11.
| Author is: O'Reilly, Sally, 1971- | 4 |
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