| Author | Titles | | 1.
| Ullens, Guy F., Barão, 19--?- | 1 | | 2.
| Ullibarri, Susana | 1 | | 3.
| Ullman, Berthold Louis | 1 | | 4.
| Ullmann, Stephen | 5 | | 5.
| Ulloa, Ángel C. | 1 | | 6.
| Ulloa, Francisco Antonio, 1783-1816 | 1 | | 7.
| Ulloa, Iliana | 1 | | 8.
| Ulloa, Luís, 1869-1936 | 2 | | 9.
| Ullrich, Ferdinand | 4 | | 10.
| Ullrich, Wolfgang | 1 |
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