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By: Pickering, Edward CType: ArticleIn: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledgeVolume: 45Series:Issue: 182Date: 1906Page Range: 44--53Publication Info: Philadelphia, American Philosophical Society,Subjects:
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By: Pickering, Edward CType: ArticleIn: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledgeVolume: 51Series:Issue: 207Date: 1912Page Range: 564--567Publication Info: Philadelphia, American Philosophical Society,Subjects: