Julius Robert von Mayer. Wood engraving by Hummel, 18--.
- Hummel, wood-engraver.
- Date:
- [between 1800 and 1899]
- Reference:
- 658046i
Licence: Public Domain Mark
Credit: Julius Robert von Mayer. Wood engraving by Hummel, 18--. Wellcome Collection. Source: Wellcome Collection.
