Search Results - Van der Walt, Petrus Jacobus

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    Coal cleaning, with special reference to the development and application of the cyclone washer by Van der Walt, Petrus Jacobus

    Published 2017
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    Die beplanning van 'n plaas as besproeiingseenheid met verwysing na die besproeiingstelsel, besproeiingsprodukte, meganisasie en ekonomiese regverdiging. by Van der Walt, Petrus Jacobus

    Published 2012
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