| Author | Titles | | 1.
| Duncan, Alastair | 20 | | 2.
| Duncan, Carol | 2 | | 3.
| Duncan, Catherine | 3 | | 4.
| Duncan, Charles H. | 1 | | 5.
| Duncan, David Douglas, 1916-2018 | 3 | | 6.
| Duncan, Ian | 1 | | 7.
| Duncan, Isadora, 1878-1927 | 3 | | 8.
| Duncan, J. Alastair | 1 | | 9.
| Duncan, John | 1 | | 10.
| Duncan, John, 1866-1945 | 1 |
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