Kōrero: Rock, limestone and clay

Ngā whakaahua, ngā rauemi katoa

Me pēnei te tohu i te whārangi:

Carl Walrond, 'Ngā whakaahua, ngā rauemi katoa', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/rock-limestone-and-clay/media (accessed 3 April 2020)

He kōrero nā Carl Walrond, i tāngia i te 12 Jun 2006