The spectroscope and its work / [Richard A. Proctor].
- Proctor, Richard A. (Richard Anthony), 1837-1888.
- Date:
- 1877
Licence: Public Domain Mark
Credit: The spectroscope and its work / [Richard A. Proctor]. Source: Wellcome Collection.
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Licence: Public Domain Mark
Credit: The spectroscope and its work / [Richard A. Proctor]. Source: Wellcome Collection.