| Author | Titles | | 1.
| Thomas, Gregory | 1 | | 2.
| Thomas, Gwen, 1968- | 1 | | 3.
| Thomas, Gwilym | 1 | | 4.
| Thomas, H. | 1 | | 5.
| Thomas, H. H., 1876-1935 | 4 | | 6.
| Thomas, Helen | 1 | | 7.
| Thomas, Henry, 1878-1952 | 16 | | 8.
| Thomas, Herbert Henry, 1876-1935 | 0 | | 9.
| Author is: Thomas, H. H., 1876-1935 | 4 | | 10.
| Thomas Hope, 1796-1831 | 0 | | 11.
| Author is: Hope, Thomas, 1796-1831 | 1 | | 12.
| Thomas, Hugh, 1931-2017 | 1 |
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