| Author | Titles | | 1.
| Clarkson, Glynn | 1 | | 2.
| Clarkson, Thomas | 1 | | 3.
| Claro, Ana | 1 | | 4.
| Claro, António, 1863-1931 | 4 | | 5.
| Claro, Catarina | 1 | | 6.
| Claro, João Martins | 1 | | 7.
| Claro, João V., pseud. | 7 | | 8.
| Related author: Frias, Eduardo, 1895-1975 | 4 | | 9.
| Claro, Nunes | 9 | | 10.
| Claro, Rogério | 5 | | 11.
| Clasen, Dirck | 1 |
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