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By: Keller, Harry F - Maas, PhilipType: ArticleIn: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledgeVolume: 43Series:Issue: 176Date: 1904Page Range: 105--112Publication Info: Philadelphia, American Philosophical Society,Subjects:
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By: Keller, Harry FType: ArticleIn: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledgeVolume: 47Series:Issue: 188Date: 1908Page Range: 79--85Publication Info: Philadelphia, American Philosophical Society,Subjects:
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By: Keller, Harry FType: ArticleIn: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledgeVolume: 48Series:Issue: 191Date: 1909Page Range: 65--66Publication Info: Philadelphia, American Philosophical Society,Subjects: