Search Results       Your search for [subject]Opals returned 1 record.           Prospecting for gold; from the dish to the hydraulic plant, and from the dolly to the stamper battery. With chapters on tin, osmiridium, platinum, opals and oil. With a chapter on Prospecting for oil by W.G. Woolnough. by Idriess, Ion LLewellyn, 1890-; [Sydney]: Angus and Robertson, 1966. Subject: Prospecting; Gold mines and minig -- Australia; Opals.          Add to Book Cart Relevance: 12.95%