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  1.  19
    ‘Perlite’ and Palygorskite in Theophrastus.Robert H. S. Robertson - 1963 - The Classical Review 13 (02):132-.
  2.  35
    The Fuller's Earths of the Elder Pliny.Robert H. S. Robertson - 1949 - The Classical Review 63 (02):51-52.
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