February 2019 - Jeffrey E. Post, The Hope Diamond and Smithsonian National Gem Collection.
January 2019 - John Dilles, Using the Zonation of Trace Metal Geochemistry and Hydrothermal Mineralogy for Porphyry Copper Mineral Exploration
February 2019 - Jeffrey E. Post, The Hope Diamond and Smithsonian National Gem Collection.
January 2019 - John Dilles, Using the Zonation of Trace Metal Geochemistry and Hydrothermal Mineralogy for Porphyry Copper Mineral Exploration