Works of "Research Collection"
Place Collected: Republic Mine
Place Collected: Daoping Pb-Zn Mine
Place Collected: San Benito Co.
Place Collected: George Earle Farm
Place Collected: Pocos de Caldas
Place Collected: Koksha Valley
Place Collected: Erongo Mountains
Place Collected: Jacupiranga Mine
Place Collected: Steiner Prospect