| Re Camillo |
| Re Filippo |
| Re Del Luigi |
| Réaumur |
| Rebus De |
| Recherches |
| Reckenbergerus M. Joh. Leonhardus |
| Recueil |
| Recueil |
| Recueil |
| Recueil |
| Recueil |
| Recueil |
| Recupitus Julius |
| Redi Diego |
| Redi Francesco |
| Reding Augustinus |
| Reflexions |
| Reflexions |
| Reflexions |
| Refutatio |
| Regaliae |
| Reggiani Pietro |
| Regi Domenico |
| Reginaldus Valerius |
