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  1. By: Agassiz, Louis,
    Publication info: Neuchâtel, Impr. de H. Wolfrath, 1845
    Holding Institution: Delaware Museum of Natural History Library
    Subjects: From 2 to 65 million years ago  Mollusks, Fossil  Mollusques  Paleontology  Tertiaire (ère géologique)  Tertiary  Tertiary Geologic Period