| Author | Titles | | 1.
| Rolo, Raul de Almeida, frei | 2 | | 2.
| Rolot, Christian | 1 | | 3.
| Roma, Bento Esteves | 1 | | 4.
| Roma, Carlos Morato | 1 | | 5.
| Roma, Célia | 2 | | 6.
| Roma. Istituto di Studi Romani | 1 | | 7.
| Roma, Valentín | 2 | | 8.
| Romagosa, Gemma | 1 | | 9.
| Romaguera i Ramió, Joaquim | 36 | | 10.
| Romahn, Carolina | 1 |
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