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  1. By: Walcott, Albert J.,
    Publication info: Chicago, Field Museum of Natural History, 1937
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Garnet  Quartz  Sapphires  Spinel
  2. By: Frondel, Clifford,
    Publication info: New York City, The American Museum of Natural History, [1934]
    Holding Institution: American Museum of Natural History Library
    Subjects: 54.9,5  Amethysts  Color  Crystallography  Quartz  Quartz crystals
  3. By: Frondel, Clifford,
    Publication info: New York City, The American Museum of Natural History, [1936]
    Holding Institution: American Museum of Natural History Library
    Subjects: 54.8,5  Chester County  Colorado  Crystal growth  Crystallography  Dislocations in crystals  El Paso County  Minerals  Pennsylvania  Pyrites  Quartz