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  1. 1
    Compilation of radiometric age determinations in Arizona /
    Published 1986
    Government Document Book
  2. 2
    Geochemistry and geochronology of middle Tertiary volcanic rocks of the Central Chiricahua Mountains, southeast Arizona /
    by Du Bray, E. A.
    Published 2004
    Government Document Book
  3. 3
    Geochemistry and geochronology of middle Tertiary volcanic rocks of the Central Chiricahua Mountains, Southeast Arizona /
    Get full text
    Government Document eBook
  4. 4
    Telling time at Grand Canyon National Park : 2020 update /
    by Karlstrom, Karl E.
    Published 2021
    Get full text
    Government Document eBook
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