Freeman Bibliographical Database
| Identifier: | F1900.20 |
| Date: | 2013 |
| Concise reference: | Burkhardt, F., J. A. Secord et al eds. 2013. The correspondence of Charles Darwin. Cambridge: Cambridge University Press. vol. 20: 1872. |
| Identifier: | F1900.20 |
| Date: | 2013 |
| Concise reference: | Burkhardt, F., J. A. Secord et al eds. 2013. The correspondence of Charles Darwin. Cambridge: Cambridge University Press. vol. 20: 1872. |