| Author | Titles | | 1.
| Ratton Cerâmicas (Lisboa, Portugal) | 22 | | 2.
| Ratton, Diogo, 1765-1822 | 1 | | 3.
| Ratton, Jacome, 1736-1820 | 1 | | 4.
| Raty, Suzanne | 1 | | 5.
| Ratz, Ludovic | 1 | | 6.
| Rau, Bernd | 1 | | 7.
| Rau, Cordula | 2 | | 8.
| Rau, Fernando, 1902-1977 | 5 | | 9.
| Rau, Johannes | 1 | | 10.
| Rau, Jörn | 1 |
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