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Start Over Subjects Unio -- classification ✖Remove constraint Subjects: Unio -- classification Titles Extracts from the Proceedings of the Academy of Natural Sciences of Philadelphia, of papers ✖Remove constraint Titles: Extracts from the Proceedings of the Academy of Natural Sciences of Philadelphia, of papers Dates by Range 1850-1899 ✖Remove constraint Dates by Range: 1850-1899

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  • Extracts from the Proceedings of the Academy of Natural Sciences of Philadelphia, of papers1