| Author | Titles | 1.
| Rio, Mariana, 1986- | 1 | 2.
| Rio, Pedro | 3 | 3.
| Rio, Rita | 1 | 4.
| Rio, Rui | 1 | 5.
| Río, Víctor del, 19--?- | 11 | 6.
| Riobom, Vasco | 1 | 7.
| Rio-Carvalho, Manuel Pedro do, 1928-1994 | 0 | 8.
| Author is: Carvalho, Manuel Rio, 1928-1994 | 22 | 9.
| Rioland, Stéphane | 1 | 10.
| Riondet, Philippe | 1 | 11.
| Riopelle, Christopher | 4 |
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