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Start Over You searched for: Degree B A ✖ Remove constraint Degree: B A Year 2015 ✖ Remove constraint Year: 2015 Thesis Supervisor Kenneth Gale Hirth ✖ Remove constraint Thesis Supervisor: Kenneth Gale Hirth Thesis Supervisor Timothy Michael Ryan ✖ Remove constraint Thesis Supervisor: Timothy Michael Ryan Keyword GIS ✖ Remove constraint Keyword: GIS Keyword Guatemala ✖ Remove constraint Keyword: Guatemala Keyword Portable X-Ray Fluorescence ✖ Remove constraint Keyword: Portable X-Ray Fluorescence Access Level open_access ✖ Remove constraint Access Level: open_access