| Author | Titles | | 1.
| Ruhé, Harry | 1 | | 2.
| Ruhemann, Helmut | 2 | | 3.
| Ruhlmann, Émile Jacques, 1879-1933 | 2 | | 4.
| Ruhlmann, Jacques-Émile, 1879-1933 | 0 | | 5.
| Author is: Ruhlmann, Émile Jacques, 1879-1933 | 2 | | 6.
| Ruhmer, E. | 1 | | 7.
| Ruhmer, Eberhard | 4 | | 8.
| Rühnemann, Eugen | 1 | | 9.
| Ruhr. 2010. Capital Europeia da Cultura | 1 | | 10.
| Ruhrberg, Bettina | 5 | | 11.
| Ruhrberg, Karl, 1924- | 2 |
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