Darwin Online Manuscript Catalogue
| Identifier: | PC-USA-GrayVariation |
| Date: | 1868 |
| Name: | Darwin Charles Robert, Gray Asa |
| Attributed title: | Letter to Asa Gray on Variation |
| Document type: | Correspondence |
| Identifier: | PC-USA-GrayVariation |
| Date: | 1868 |
| Name: | Darwin Charles Robert, Gray Asa |
| Attributed title: | Letter to Asa Gray on Variation |
| Document type: | Correspondence |