| Author | Titles | | 1.
| Ullán, José M. | 1 | | 2.
| Ullán, José Miguel, 1944-2009 | 2 | | 3.
| Ullân, Maria Dolores Raich | 1 | | 4.
| Ulland, Wolfgang | 1 | | 5.
| Ullendorff, Edward | 1 | | 6.
| Ullens, Guy F., Barão, 19--?- | 1 | | 7.
| Ullibarri, Susana | 1 | | 8.
| Ullman, Berthold Louis | 1 | | 9.
| Ullmann, Stephen | 5 | | 10.
| Ulloa, Ángel C. | 1 |
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