| Autor | Títulos | | 1.
| Uriel, Belén, 1974- | 2 | | 2.
| Ürkmez, Basak | 1 | | 3.
| Url, Martin | 1 | | 4.
| Urlichs, Heinrich Ludwig, 1864- | 1 | | 5.
| Urlichs, Heinrich Lydwig, 1864- | 0 | | 6.
| Ver: Urlichs, Heinrich Ludwig, 1864- | 1 | | 7.
| Urquart, Rachel | 1 | | 8.
| Urquart, Ross | 1 | | 9.
| Urquhart, Donald, 1959- | 1 | | 10.
| Urquidi, Marina | 1 | | 11.
| Urrabieta Ortiz y Vierge, Daniel, 1851-1904 | 0 | | 12.
| Ver: Vierge, Daniel, 1851-1904 | 2 |
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