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A DETERMINISTIC SIMULATION MODEL TO AID SELECTION OF MANAGEMENT STRATEGIES FOR COMBATING MINERAL POLLUTION IN THE PRETORIA-WITWATERSRAND-VEREENIGING (PWV) REGION = UN MODELE DETERMINISTE DE SIMULATION POUR FACILITER LE CHOIX DES STRATEGIES DE GESTION POUR COMBATTRE LA POLLUTION MINERALE DANS LA REGION PRETORIA-WITWATERSAND-VEREENIGING (PWV)HEROLD CE.1982; IAHS-AISH PUBLICATION; ISSN 0144-7815; GBR; DA. 1982; NO 139; PP. 245-254; BIBL. 12 REF.; 2 TAB. ; TABL./ILL.Conference Paper