| Author | Titles | 1.
| Ruehlman, Robert | 1 | 2.
| Ruela, Paula, 1954- | 0 | 3.
| Author is: Ruella, Paula, 1954- | 12 | 4.
| Ruella, Ana Paula de Sousa Teixeira, 1954- | 0 | 5.
| Author is: Ruella, Paula, 1954- | 12 | 6.
| Ruella, Paula, 1954- | 12 | 7.
| Ruesch, A., 1882-1929 | 1 | 8.
| Ruesch, Arnold, 1882-1929 | 0 | 9.
| Author is: Ruesch, A., 1882-1929 | 1 | 10.
| Ruetz, Michael, 1940- | 2 | 11.
| Ruf, Beatrix, 1960- | 21 | 12.
| Ruf, Gerhard | 1 | 13.
| Rüf, Isabelle | 1 |
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