| Author | Publications | Articles |
|---|---|---|
 Ubbo-Spamla | 0 | 1 |
 Ubide Diaz, Damian | 1 | 1 |
 Ugo Bardi | 3 | 2 |
| Uhls, R Scott | 0 | 1 |
| Uhls, Scott | 1 | 1 |
| Uitvlugt, Donald Jacob | 0 | 1 |
| Ulises Santos Espino | 0 | 3 |
| Ulo Leppik | 1 | 1 |
| Ulrich, H | 1 | 13 |
| Ultan McDonnell | 1 | 1 |
| Umberto Pignatelli | 1 | 1 |
| Underwood, Nicholas | 1 | 0 |
| Unger, Greg | 0 | 2 |
| Unknown | 199 | 263 |
| Urban, Scott H | 0 | 1 |
| Urbanowicz, Janusz A | 0 | 1 |
| Uren, Tim | 8 | 8 |
| Urquart, Clio | 1 | 1 |
| Usera, Ignacio Sanchez | 1 | 1 |
| Utech, Andrew | 1 | 1 |
| Uth, Alex | 1 | 1 |
| Uthman, Ed | 0 | 1 |
| Uyl, Anthony | 3 | 3 |