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By: Hagen, Johann G.,Type: ArticleIn: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledgeVolume: 20Series:Issue: 111Date: 1882Page Range: 206--223Publication Info: Philadelphia, American Philosophical Society,Subjects:
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By: Hagen, Johann G.,Type: ArticleIn: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledgeVolume: 21Series:Issue: 114Date: 1883Page Range: 93--101Publication Info: Philadelphia, American Philosophical Society,Subjects: