| Hugo de S. Caro |
| Hugo Victor |
| Hugo Gustav |
| Hugo Gustav |
| Huillier (L') R. |
| Humboldt (de) Alessandro |
| Humboldt Alezandre |
| Hunauld |
| Hundeshagen Jo: Christophorus |
| Hungs Petrus |
| Hunter Guillelmus |
| Huschke Ph. Quardus |
| Hurter H. |
| Huschke C. |
| Hussey Thomas |
| Hutchinson Roger |
| Huttenbacher Josephus |
| Hyginius |
| Hymans Henri |
| -- NON INTESTATA -- |
| Supplementum General. Littera I |
| -- NON INTESTATA -- |
| Iabalot Ferdinando |
| Iachiel |
| Iacobi S. P. |
