Kōrero: Irrigation and drainage

Ngā whakaahua, ngā rauemi katoa

Me pēnei te tohu i te whārangi:

Terry Heiler, 'Ngā whakaahua, ngā rauemi katoa', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/irrigation-and-drainage/media (accessed 23 November 2019)

He kōrero nā Terry Heiler, i tāngia i te 24 Nov 2008