Some nomographs for the calculation of drain spacings

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Kaituhi matua: Van Beers, W. F. J (Author)
Hōputu: Pukapuka
Reo:Ingarihi
I whakaputaina: Wageningen ILRI 1979
Rangatū:Bulletin, 8
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Kāore He Tūtohu, Me noho koe te mea tuatahi ki te tūtohu i tēnei pūkete!