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By: Rex, G AType: ArticleIn: Proceedings of the Academy of Natural Sciences of PhiladelphiaVolume: 42Series:Issue: 2Date: 1890Page Range: 192--196Publication Info: Philadelphia, Academy of Natural Sciences of Philadelphia,Subjects:
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By: Rex, G AType: ArticleIn: Proceedings of the Academy of Natural Sciences of PhiladelphiaVolume: 43Series:Issue:Date: 1891Page Range: 389--398Publication Info: Philadelphia, Academy of Natural Sciences of Philadelphia,Subjects:
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By: Rex, G AType: ArticleIn: Proceedings of the Academy of Natural Sciences of PhiladelphiaVolume: 45Series:Issue: 3Date: 1893Page Range: 364--372Publication Info: Philadelphia, Academy of Natural Sciences of Philadelphia,Subjects: