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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Murchison, Roderick Impey, Sir,
    Edition: 5th ed. With map and two hundred illustrations.
    Publication info: London, J. Murray, 1872
    Holding Institution: Field Museum of Natural History Library
    Subjects: From 405 to 425 million years ago  Geology, Stratigraphic  Gold  Silurian  Silurian Geologic Period  Silurien, géologie  Silurien, paléontologie