| Author | Titles | | 1.
| Olaio, Ludgera Maggiolly, 1900-? | 1 | | 2.
| Olaio, Pedro, 1903-1997 | 1 | | 3.
| Olaio, Pedro, 1930- | 0 | | 4.
| Author is: Olayo Filho, Pedro, 1930- | 3 | | 5.
| Olaio, Pedro, filho | 0 | | 6.
| Author is: Olayo Filho, Pedro, 1930- | 3 | | 7.
| Olaio, Pedro, pai | 0 | | 8.
| Author is: Olaio, Pedro, 1903-1997 | 1 | | 9.
| Olalquiaga, Céleste | 1 | | 10.
| Olano, Antonio D. | 1 | | 11.
| Olano Ereña, Luis | 1 | | 12.
| Olaré, pseud. | 0 | | 13.
| Author is: Cabral, António, 1863-1956 | 67 | | 14.
| Olarte, Filipe, 1450-1536 | 0 | | 15.
| Author is: Hodart, Philippe, 1450-1534 | 2 |
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