| Reference number | LBO/6/39 |
| Alternative reference number | LBO/6/99 |
| Level | File |
| Title | Copy microscopicall observations from Dr de Graaf to Henry Oldenburg |
| Date | 28 April 1673 |
| Description | Observations included in the letter from Dr de Graaf to Henry Oldenburg dated 28 April 1673 |
| Language | English |
| Extent | 2p |
| Format | Manuscript |
| Access status | Open |
| Related material | LBO/6/38; |