Sulphate of potash for quality.

I tiakina i:
Ngā taipitopito rārangi puna kōrero
Hōputu: Pukapuka
I whakaputaina: Wien : Kali-Export Gesellschaft, [1986].
Ngā marau:
Potassium fertilizers.
Sulphates.
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Whakaahuatanga
Whakaahuatanga ōkiko:11 p. : col. ill.

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