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Dyfyniad Arddull ChicagoL C P.M.Stuyt. FAO Irrigation and Drainage Paper N60: Materials for Subsurface Land Drainage Systems. Rome: FAO, 2000.
Dyfyniad MLAL C P.M.Stuyt. FAO Irrigation and Drainage Paper N60: Materials for Subsurface Land Drainage Systems. Rome: FAO, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.