Kōrero: Superphosphate
Whārangi 6. Ngā whakaahua, ngā rauemi katoa
From page 1 - Superphosphate history
From page 2 - Making superphosphate
From page 3 - New Zealand superphosphate
From page 4 - Superphosphate pros and cons
Me pēnei te tohu i te whārang
Arthur Duncan, Superphosphate, Te Ara – the Encyclopedia of New Zealand, https://teara.govt.nz/mi/story/4050/media (accessed 14 June 2026).
He kōrero nā Arthur Duncan, i tāngia i te 1 March 2009.