G. Küstel

• Nevada and California processes of silver and gold extraction ..
• Roasting of gold and silver ores
• Procedimiento para la extracción del oro y de la plata practicado en Nevada y California
• Report of Guido Küstel, commissioner to the Vienna Exposition of 1873
• Report of Guido Kustel, commissioner to the Vienna Exposition of 1873
• Roasting of Gold and Silver Ores, and the Extraction of Their Respective Metals Without Quicksilver