| Autor | Títulos | | 1.
| Urquidi, Marina | 1 | | 2.
| Urrabieta Ortiz y Vierge, Daniel, 1851-1904 | 0 | | 3.
| Ver: Vierge, Daniel, 1851-1904 | 2 | | 4.
| Urraca Uribe, Susana | 2 | | 5.
| Urrea Fernandez, Jesus | 4 | | 6.
| Urrea, Jesús | 2 | | 7.
| Urreta, Luis de, O.P. | 1 | | 8.
| Urrios, Juan, 1962- | 1 | | 9.
| Urriza, Juan | 1 | | 10.
| Urroz Arancibia, Carlos, 1966- | 0 | | 11.
| Ver: Urroz, Carlos, 1966- | 3 | | 12.
| Urroz, Carlos, 1966- | 3 |
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