| Author | Titles | 1.
| Omm, Gerald | 1 | 2.
| Ommanney, Francis Downing | 1 | 3.
| Ommer, Uwe | 1 | 4.
| Omont, Henri Auguste | 1 | 5.
| O'More, Haven | 1 | 6.
| Omoto, Keiko | 1 | 7.
| Omura, Rieko | 1 | 8.
| Omura, Seigai, 1868-1927 | 1 | 9.
| On Kawara 1933-2014 | 0 | 10.
| Author is: Kawara, On, 1933-2014 | 1 | 11.
| Onaka, Koji, 1960- | 2 |
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