| Author | Titles | 1.
| Ojetti, Ugo, 1871-1946 | 4 | 2.
| Ojukwu | 1 | 3.
| O.K Center for Contemporary Art (Áustria) | 1 | 4.
| O.K. Centrum für Gegenwartskunst (Linz, Áustria) | 1 | 5.
| Oka, Hideyuki | 1 | 6.
| Oka, Isaburo | 1 | 7.
| Okabe, Miki | 1 | 8.
| Okabe, N. | 1 | 9.
| Okada, Amina | 4 | 10.
| Okada, Satochi, 19--?- | 1 |
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