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  1. 1
    Published 1985
    Pretoria, South Africa : National Institute for Water Research, Council for Scientific and Industrial Research, 1985.
    183 p. ; 30 cm.
    [viii], 183 leaves : ill. ; 30 cm.
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  2. 2
    London : Lutterworth Press, 1954.
    152 p., [47] p. of plates : ill., maps, ports. 23 cm.
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