| Author | Titles | | 1.
| Rühnemann, Eugen | 1 | | 2.
| Ruhr. 2010. Capital Europeia da Cultura | 1 | | 3.
| Ruhrberg, Bettina | 5 | | 4.
| Ruhrberg, Karl, 1924- | 2 | | 5.
| Ruhrkohle Umwelt AG (Bottrop, Alemanha) | 1 | | 6.
| Ruhs, August | 1 | | 7.
| Rui, Alberto | 1 | | 8.
| Rui, Angela | 1 | | 9.
| Rui Athouguia, 1917-2006 | 0 | | 10.
| Author is: Atouguia, Rui, 1917-2006 | 25 | | 11.
| Rui Atouguia, 1917-2006 | 0 | | 12.
| Author is: Atouguia, Rui, 1917-2006 | 25 |
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