Pepper, John Henry. “Figure 38. ‘The Keepier Mine," near Durham.” The Playbook of Metals : Including Personal Narratives of Visits to Coal, Lead, Copper, and Tin Mines; with a Large Number of Interesting Experiments Relating to Alchemy and the Chemistry of Fifty Metallic Elements. London, England, 1862. https://digital.sciencehistory.org/works/qde82vf.
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