| Author | Titles | | 1.
| Orloff, Sophie | 1 | | 2.
| Orlofsky, Sam | 1 | | 3.
| Orlovsky, Peter | 1 | | 4.
| Orlow, Roman | 1 | | 5.
| Orlowa-Kopelewa, Raissa | 1 | | 6.
| Ormaechea, Agustín | 1 | | 7.
| Ormanian, Malachia | 1 | | 8.
| Ormanian, Malachia, Archevêque | 1 | | 9.
| Orme, Philibert de L', 1510?-1570 | 0 | | 10.
| Author is: Delorme, Philibert, 1510?-1570 | 1 | | 11.
| Ormeau Baths Gallery (Belfast, Grã-Bretanha) | 4 |
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