| Author | Titles | | 1.
| Roothaan, Joanne | 2 | | 2.
| Rooyen, Johan van | 1 | | 3.
| Roozen, Pieter | 1 | | 4.
| Rop, Anton | 1 | | 5.
| Ropars Wuilleumier, Marie-Claire | 2 | | 6.
| Roper, Hugh Redwald Trevor | 1 | | 7.
| Roper, William | 1 | | 8.
| Ropero-Regidor, Diego | 1 | | 9.
| Ropers, Heinrich | 3 | | 10.
| Roppel, Patrick | 1 |
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