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From Peter S. Robertson 30 April 1867
Summary
Describes his attempts to cross different varieties of borecole, and the results of the crosses.
| Author: | Peter Skene Robertson |
| Addressee: | Charles Robert Darwin |
| Date: | 30 Apr 1867 |
| Classmark: | DAR 76: B49–51 |
| Letter no: | DCP-LETT-5519 |
