Arizona Geological Society

March 2018Joe Wilkins, Jr., Retired Consulting Geologist, Piedras Verdes and Cuatro Hermanos, Sonora, Mexico - A Tale of Two Porphyries

February 2018 - Paul F. Hlava, Access to Gems and Minerals, Causes of Color in Minerals and Gemstones

January 2018 - Peter L. Ward, Retired, U. S. Geological Survey, Bringing Peace to the Climate Wars

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