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A DISAPPOINTING YEAR FOR INDUSTRIAL MINERALS PRODUCTION: SELECTED DATA ON NONMETALLIC MINERAL PRODUCTIONLEFOND SJ ED; AUSTIN G; FARRELL EA et al.1980; MIN. ENG. (N.Y.); ISSN 0026-5187; USA; DA. 1980; VOL. 32; NO 5; PP. 558-589; BIBL. DISSEM.Article
