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To A. R. Wallace 23 September [1868]
Summary
On their differences concerning sexual selection and protection.
| Author: | Charles Robert Darwin |
| Addressee: | Alfred Russel Wallace |
| Date: | 23 Sept [1868] |
| Classmark: | The British Library (Add MS 46434: 153–6) |
| Letter no: | DCP-LETT-6386 |
