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By: Hammond, William AType: ArticleIn: Proceedings of the Academy of Natural Sciences of PhiladelphiaVolume: 10Series:Issue:Date: 1858Page Range: 17--21Publication Info: Philadelphia, Academy of Natural Sciences of Philadelphia,Subjects:
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By: Hammond, William AType: ArticleIn: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledgeVolume: 20Series:Issue: 111Date: 1882Page Range: 227--228Publication Info: Philadelphia, American Philosophical Society,Subjects: