| Author | Titles | | 1.
| Urreta, Luis de, O.P. | 1 | | 2.
| Urrios, Juan, 1962- | 1 | | 3.
| Urriza, Juan | 1 | | 4.
| Urroz Arancibia, Carlos, 1966- | 0 | | 5.
| Author is: Urroz, Carlos, 1966- | 3 | | 6.
| Urroz, Carlos, 1966- | 3 | | 7.
| Urrutia, Antonio | 1 | | 8.
| Urrutia Baliño, María | 5 | | 9.
| Urrutia, Bélen | 1 | | 10.
| Urrutia Núñez, Ángel | 1 | | 11.
| Urrutikoetxea, Raúl, 1962-2002 | 1 |
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