Freeman Bibliographical Database
| Identifier: | A2935 |
| Date: | 1861 |
| Concise reference: | Brent, B. P. 1861. Period of incubation of call-duck [query on behalf of Darwin]. The Field (16 March): 17. |
| Identifier: | A2935 |
| Date: | 1861 |
| Concise reference: | Brent, B. P. 1861. Period of incubation of call-duck [query on behalf of Darwin]. The Field (16 March): 17. |