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by Van Berkel, P. R. (Patrick Robin); Williams, R. D. -- Hydrology Centre (Christchurch, N.Z.); New ZealandMinistry of Works and Development.
by Williams, R. D. -- Hydrology Centre (Christchurch, N.Z.); New ZealandMinistry of Works and Development.; Water and Soil Science Centre (Christchurch, N.Z.); National Water and Soil Conservation Organisation (N.Z.)
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