Works of "Research Collection"
Place Collected: Noche Buena Mine
Place Collected: Helgustadir Mine
Place Collected: Wheal Crebor
Place Collected: George & Charlotte Mine
Place Collected: Tavistock
Place Collected: Shattuck Mine (Shattuck-Denn Mine)
Place Collected: Naica Mine
Place Collected: Wakefield
Place Collected: 79 Mine (79th Mine; Seventy-Nine Mine; Seventy-Nine property; McHur prospect)
Place Collected: Goodsprings
Place Collected: Zacatecas