| Author | Titles | | 1.
| Gracyk, Theodore A. | 1 | | 2.
| Grad, A.-D. | 1 | | 3.
| Grade, Eugénio Dionísio Mascarenhas, Visconde de Lagoa | 1 | | 4.
| Grade, Fernando, 1943- | 35 | | 5.
| Grade, José | 1 | | 6.
| Gradi, Marco | 1 | | 7.
| Gradidge, Roderick | 1 | | 8.
| Gradim, António, 1954- | 1 | | 9.
| Gradjean, Bredo L. | 1 | | 10.
| Gradmann, Erwin | 3 |
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