| Author | Titles | | 1.
| Orlandini, Piero | 1 | | 2.
| Orlando, Anna | 1 | | 3.
| Orlando Azevedo | 1 | | 4.
| Orlando, Jean-Pierre | 1 | | 5.
| Orlando, Peter | 1 | | 6.
| Orlando, Valerio Rocco, 1978- | 1 | | 7.
| Orléan, Matthieu | 1 | | 8.
| Orléans. Bibliothèque Municipale | 1 | | 9.
| Orléans, Charles de, 1391-1465 | 2 | | 10.
| Orléans, Duque de | 1 |
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