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Start Over Subjects Lens, Crystalline ✖Remove constraint Subjects: Lens, Crystalline Authors Burnett, Swan M. (Swan Moses), 1847-1906, author ✖Remove constraint Authors: Burnett, Swan M. (Swan Moses), 1847-1906, author Titles On the reform in numbering prisms ✖Remove constraint Titles: On the reform in numbering prisms

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