Freeman Bibliographical Database
| Identifier: | F1900.18 |
| Date: | 2010 |
| Concise reference: | Burkhardt, F., J. A. Secord et al eds. 2010. The correspondence of Charles Darwin. Cambridge: Cambridge University Press. vol. 18: 1870. |
| Identifier: | F1900.18 |
| Date: | 2010 |
| Concise reference: | Burkhardt, F., J. A. Secord et al eds. 2010. The correspondence of Charles Darwin. Cambridge: Cambridge University Press. vol. 18: 1870. |