| Author | Titles | 1.
| Olalquiaga, Céleste | 1 | 2.
| Olano, Antonio D. | 1 | 3.
| Olano Ereña, Luis | 1 | 4.
| Olaré, pseud. | 0 | 5.
| Author is: Cabral, António, 1863-1956 | 67 | 6.
| Olarte, Filipe, 1450-1536 | 0 | 7.
| Author is: Hodart, Philippe, 1450-1534 | 2 | 8.
| Olarte, Natalia | 1 | 9.
| Olasagasti, Eduardo | 1 | 10.
| Olaso, Ezeqiel de | 1 | 11.
| O'Laughlin, Bridget | 1 | 12.
| Olausson, Magnus | 3 |
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