13426 Adelaide Rigby 1977 1st Edition hardbound profusely illustrated 12mo Dustwrapper 159pp Very Good in Very Good dustwrapper Practical and authoritative field guide to Australian Opals, with introductory text, followed by sections on Qld Opal, Black Opal, Australian Opal Mining, Opal values, Opalised Fossils, and appendices showing colour wheel, and detailing opal structure, constructions, geological time chart, and list of maps; includes numerous colour photos with descriptive text; this copy has a minor knock top text block, with minor creases to some pages, o.w. Very Good and clean throughout in Very Good dustwrapper (mylar protected). ISBN: 0-7270-0387-9 $20.00AUD
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