Works of "Research Collection"
Place Collected: N of Bancroft
Place Collected: East Bradford
Place Collected: Madonna Mine
Place Collected: Steward Mine (Stewart mine)
Place Collected: El Carmen Mine
Place Collected: Globe Mine (2)
Place Collected: Ottawa Silica Co. Quarry
Place Collected: American Canyon
Place Collected: Rancho de Tepueste
Place Collected: Guadalupana Mine
Place Collected: Angels Camp District
Place Collected: Tobin Creek Mine