Once the soil survey of the North Island was completed, in 1942, it was possible to relate soil type to other factors. This newsreel clip shows how tooth decay appeared to be related to local variations in soil type.
Te whakamahi i tēnei tūemi
Archives New Zealand - Te Rua Mahara o te Kāwanatanga
Reference: Pictorial Parade 53, National Film Unit, 1956
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