| Author | Titles | 1.
| Ondjaki, pseud. | 1 | 2.
| Önduygu, Deniz Cem | 1 | 3.
| The one Club For Art & Copy ( (Nova Iorque, Estados Unidos) | 2 | 4.
| One Minutes Foundation (Amsterdão, Holanda) | 1 | 5.
| O'Neal, Hank | 1 | 6.
| O'Neal, Mary Lovelace, 1942- | 1 | 7.
| Onegger, A., 1892-1955 | 0 | 8.
| Author is: Honegger, Arthur, 1892-1955 | 2 | 9.
| Onegger, Arthur, 1892-1955 | 0 | 10.
| Author is: Honegger, Arthur, 1892-1955 | 2 | 11.
| O'Neil, Alexandre | 1 | 12.
| O'Neil, Eugenio | 1 |
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