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ENGINEERING AND MINING.JOURNAL 1978 INTL.DIRECTORY OF MININGAND MINERAL PROCESSING OPERATIONS.MCGRAW HILL.N.Y.1978.PP.27,336.ENG. AND MINING JOURNAL.1976 SURVEY OF MINE AND PLANTEXPANSION.JAN.1976.P.MINERALS BUREAU,S.A.DEPT.OF MINES.MINERALS MARKETING INFORM-ATION.NON-METALLIC MINES IN SOUTH AFRICA.PRELIM.REPORTNO.10,BRAAMFONTEIN,JAN.1977,P.11.MANOS,A.INDUSTRIAL MINERALS OF SOUTH AFRICA.REPRINT FROMNOV.1977 ISSUE OF INDUSTRIAL MINERALS,METAL BULL.LTD.,SURREY,ENGLAND.30 PP.DMA SERIES 1501. SHEET SG 35-8. SCALE 1:250,000.LIST OF OPERATING MINING CONCERNS IN THE REPUBLIC OF SOUTHAFRICA AS OF 1ST JANUARY, 1976. GOVT. MINING ENGINEER.BOX 1132, JOHANNESBURG, S.A.