Works of "Research Collection"
Place Collected: Laytonville Quarry (Longvale Quarry)
Place Collected: Gabbs Dist.
Place Collected: E of U.S. 395
Place Collected: El Teniente Mine
Place Collected: Superior
Place Collected: El Teniente Mine
Place Collected: Florissant
Place Collected: Mina Manganes Del Carmen
Place Collected: Chah Milleh Mine
Place Collected: Colorado
Place Collected: Bjorlykke #5 Quarry