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Start Over Subjects Pourtalès, L. F. de (Louis François de), 1824-1880. ✖Remove constraint Subjects: Pourtalès, L. F. de (Louis François de), 1824-1880. Authors Agassiz, Alexander, 1835-1910 ✖Remove constraint Authors: Agassiz, Alexander, 1835-1910 Titles Biographical sketch of Louis François de Pourtalès ✖Remove constraint Titles: Biographical sketch of Louis François de Pourtalès

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