| Author | Titles | | 1.
| Cláudio, Pedro, 1965-2016 | 5 | | 2.
| Cláudio, pseud. | 0 | | 3.
| Author is: Macedo, Diogo de, 1889-1959 | 1737 | | 4.
| Claudius, Matthias | 1 | | 5.
| Claudius-Petit, Eugène | 3 | | 6.
| Clauren, H. | 1 | | 7.
| Claus, Carlfriedrich, 1930-1998 | 1 | | 8.
| Claus en Kaan (Firma de Arquitectura) | 1 | | 9.
| Claus, Hugo | 1 | | 10.
| Claus, Jürgen 1935- | 10 | | 11.
| Clause, L. | 1 |
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