| Reference number | LBO/1/68 |
| Alternative reference number | LBO/1/187 |
| Level | File |
| Title | Copy letter from Johannes Helvelius, Gdansk, to Henry Oldenburg |
| Date | 10 September 1664 |
| Description | Concerning the observations of the eclipses of the Moon seen at Gdansk in 1663 and 1664 |
| Language | Latin |
| Extent | 5p |
| Format | Manuscript |
| Access status | Open |