| Author | Titles | | 1.
| Urrutia, Bélen | 1 | | 2.
| Urrutia Núñez, Ángel | 1 | | 3.
| Urrutikoetxea, Raúl, 1962-2002 | 1 | | 4.
| Urseau, Charles | 1 | | 5.
| Ursel, Alice de | 4 | | 6.
| Ursel, Roland de | 2 | | 7.
| Ursino, Mario | 2 | | 8.
| Ursprung, Philip, 1963- | 11 | | 9.
| URSS. | 1 | | 10.
| URSS. Constituição, 1924 | 1 |
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