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A tentative classification of the palearctic unionids.

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Neue untersuchungen �uber die entwickelungsgeschichte unserer flussmushel

• Versuch einer vollständigen Conchylienkenntniss nach Linnes System
  Author(s): Lea, Isaac ,  Schreibers, Karl von
• Versuch einer vollständigen Conchylienkenntniss nach Linnes System
  Author(s): Lea, Isaac ,  Schreibers, Karl von
• Étude sur les coquilles de la famille des nayades qui habitent le bassin du Léman
  Author(s): Lea, Isaac ,  Brot, Auguste Louis

• Geology and mineralogy considered with reference to natural theology
  Author(s): Buckland, William
• Geology and mineralogy considered with reference to natural theology
  Author(s): Buckland, William
• Contributions to geology
  Author(s): Lea, Isaac