| Reference number | LBO/8/97 |
| Alternative reference number | LBO/8/192 |
| Level | File |
| Title | Copy extract of a letter from Ernestus Gottfried Heysuis to Theodore Haak |
| Date | nd |
| Description | 'About Observations with the Thermometer and Moon about the Magnetic porosity of Gold and Silver. ' |
| Language | Spanish |
| Extent | 3p |
| Format | Manuscript |
| Access status | Open |