| Author | Titles | | 1.
| Thies-Scherrer, Hanna | 1 | | 2.
| Thiis, Jens, 1870-1942 | 1 | | 3.
| Thijsen, Alite | 1 | | 4.
| Thijsen, Mirelle, 1960- | 1 | | 5.
| Thill, Edmond | 1 | | 6.
| Thilmany, Robert | 1 | | 7.
| Thimonnier, Jean | 1 | | 8.
| Think Tank Gulbenkian sobre a Água e o Futuro da Humanidade, Lisboa, 2010-2012 | 1 | | 9.
| Thiolier, Hubert | 1 | | 10.
| Thiollier, Christiane | 1 |
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