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  1. 1
    by Bakel, P. J. T. van, 1949-
    Published 1986
    Wageningen : Instituut voor Cultuurtechniek en Waterhuishouding, 1986.
    118 p. : ill., maps ; 30 cm.
  2. 2
    Published 1982
    The Hague : TNO, 1982.
    144 p. : ill., maps ; 24 cm.
  3. 3
    Published 1974
    The Hague : The Committee, l974.
    104 p. : ill. ; 27 cm.

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