| Author | Popularity |
| Rueffel, Ruprecht |
2 |
| Rundnagel, Heike |
2 |
| Ruppel, Wilhelm G. |
2 |
| Ruppert, Marina C. |
2 |
| Rust, Karl |
2 |
| Rust, Marco (Prof. Dr.) |
2 |
| Rust, Marco B. |
2 |
| Rée, Paul |
2 |
| Röhrle, Bernd (Prof. Dr.) |
2 |
| Rössner, Dieter (Prof. Dr.) |
2 |
| Rühle, W. W. (Prof. Dr.) |
2 |
| Rüppell, Eduard |
2 |
| Saldenus, Guilielmus |
2 |
| Sarre, Friedrich |
2 |
| Sauerhering, Lucie |
2 |
| Savigny, Friedrich Carl von |
2 |
| Schack, Adolf Friedrich von |
2 |
| Scharfe, Martin (Prof. Dr.) |
2 |
| Schaub, Johannes |
2 |
| Schembera, Björn |
2 |