Darwin Online Manuscript Catalogue
| Identifier: | NHM-MSS-DAR33 |
| Date: | 1872 |
| Name: | Darwin Charles Robert, Darwin William Erasmus |
| Attributed title: | Letter Darwin Charles Robert to Darwin William Erasmus — Asks William To Observe A Suppressed Yawn |
| Document type: | Correspondence |
| Cross reference: | Calendar: 8396 |