Works of "Research Collection"
Place Collected: Ducktown Dist.
Place Collected: Ojuela Mine
Place Collected: Fairburn
Place Collected: Minas Gerais
Place Collected: near Bancroft & McFall Lake
Place Collected: near Bancroft & McFall Lake
Place Collected: Coleman Twp.
Place Collected: Rio Guaillabamba Nono
Place Collected: SE of Custer, Black Hills