| Author | Titles | | 1.
| Oncken, Wilhelm, 1838-1905 | 1 | | 2.
| Ondák, Roman, 1966- | 1 | | 3.
| Ondina, Maria | 6 | | 4.
| Ondjaki, pseud. | 1 | | 5.
| Önduygu, Deniz Cem | 1 | | 6.
| The one Club For Art & Copy ( (Nova Iorque, Estados Unidos) | 2 | | 7.
| One Minutes Foundation (Amsterdão, Holanda) | 1 | | 8.
| O'Neal, Hank | 1 | | 9.
| O'Neal, Mary Lovelace, 1942- | 1 | | 10.
| Onegger, A., 1892-1955 | 0 | | 11.
| Author is: Honegger, Arthur, 1892-1955 | 2 |
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