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  1. 1
    Description of indicator plants and methods of botanical prospecting for uranium deposits on the Colorado Plateau /
    by Cannon, Helen L., 1911-1996
    Published 1957
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    Government Document eBook
  2. 2
    Metal absorption by Equistetum (Horsetail) : a study of the metal content of horsetail plants as related to the amounts of metals in the soil on which they grew /
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    Government Document eBook
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