| Author | Titles | | 1.
| Oertmann, Paul | 1 | | 2.
| Oertzen, K. L. von | 1 | | 3.
| Oesch, Will A. | 1 | | 4.
| Oesterreich, Traugott Konstantin | 1 | | 5.
| Oesterreicher-Mollwo, Marianne | 1 | | 6.
| Oetker, Brigitte | 2 | | 7.
| Oetzman, Peter, 1978 - | 1 | | 8.
| Oever, Annie van den | 1 | | 9.
| Oey, Peter | 7 | | 10.
| Of. Gráf. A. Pacheco (Firma) | 1 |
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