| Author | Titles | | 1.
| Obón Mateos, Mercè | 1 | | 2.
| Obra, Rosa de la | 1 | | 3.
| Obregón, Alejandro, 1920-1992 | 2 | | 4.
| Obregón Roses, Daniel Alberto Alejandro María de la Santísima Trinidad, 1920-1992 | 0 | | 5.
| Author is: Obregón, Alejandro, 1920-1992 | 2 | | 6.
| Obrer, Doris J. | 1 | | 7.
| O'Brian, Glenn, 1947-2017 | 0 | | 8.
| Author is: O'Brien, Glenn, 1947-2017 | 5 | | 9.
| O'Brian, John, 1944- | 3 | | 10.
| O'Brian, Melanie | 1 | | 11.
| O'Brien, Adolphe C. | 1 | | 12.
| O'Brien, Beth | 10 |
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