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    Acid mine drainage -- South Africa -- Mpumalanga (1)
    Acid mine drainage -- South Africa -- Purification (1)
    Acid-Base Accounting (1)
    Acidithiobacillus Ferrooxidans (1)
    Australian Spocus suite (1)
    Coal (1)
    Dissertation (M.Sc. (Institute for Groundwater Studies))--University of the Free State, 2012 (1)
    Middelburg North mines (1)
    Mine water -- South Africa -- Mpumalanga (1)
    Pyrite oxidation (1)