Freeman Bibliographical Database
| Identifier: | F1900.6 |
| Date: | 1990 |
| Concise reference: | Burkhardt, F., S. Smith et al eds. 1990. The correspondence of Charles Darwin. Cambridge: Cambridge University Press. vol. 6: 1856-1857. |
| Identifier: | F1900.6 |
| Date: | 1990 |
| Concise reference: | Burkhardt, F., S. Smith et al eds. 1990. The correspondence of Charles Darwin. Cambridge: Cambridge University Press. vol. 6: 1856-1857. |