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By: Russell, Henry NorrisType: ArticleIn: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledgeVolume: 49Series:Issue: 195Date: 1910Page Range: 230--231Publication Info: Philadelphia, American Philosophical Society,Subjects:
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By: Russell, Henry NorrisType: ArticleIn: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledgeVolume: 51Series:Issue: 207Date: 1912Page Range: 569--579Publication Info: Philadelphia, American Philosophical Society,Subjects: