| Author | Titles | | 1.
| Olowska, Paulina, 1976 - | 1 | | 2.
| Olpe, Peter | 1 | | 3.
| Olphe-Galliard, G. | 1 | | 4.
| Olsberg, Nicholas | 2 | | 5.
| Olsberg, R. Nicholas | 1 | | 6.
| Olschki, Leo Samuel, 1861-1940 | 2 | | 7.
| Olsen, Barbara A. | 1 | | 8.
| Olsen, Donald J. | 2 | | 9.
| Olsen, John | 1 | | 10.
| Olsen, Kasper Nefer | 1 |
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