| Author | Titles | 1.
| Omar Khayyam, ca 1044-1123 | 15 | 2.
| Omar-Kheyyam, -1214 | 1 | 3.
| Omaswa, Francis | 1 | 4.
| Ombler, Gary | 1 | 5.
| Ombretta | 1 | 6.
| Omcikus, Marko | 1 | 7.
| Omega, pseud. | 0 | 8.
| Author is: Sousa, Eduardo Alfredo de, 1865-1927 | 3 | 9.
| Omer, Mordechai | 5 | 10.
| Omer, Mordehäi | 1 | 11.
| Omero, ca 850 a.C.-? | 0 | 12.
| Author is: Homero, ca 850 a.C.- ? | 25 |
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