TRGS  Tobacco Root Geological Society    |    Since 1973

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    TRGS 2021
    ​
    ISU Lost River Field Station 
    Mackay, ID 
    ​
    July 29 - August 1
    Register Now!

    © 2016 TOBACCO ROOT GEOLOGICAL SOCIETY - Butte, Montana    |    A 501(c)3 non-profit organization