Belajar Bareng Permaculture
Menuju Kedaulatan Pangan Nusantara!
Sumber Belajar Bareng
Book: Defining Soil Quality for a Sustainable Environment, SSSA Special Publication 35, 1994,
https://dl.sciencesocieties.org/publications/books/tocs/sssaspecialpubl/definingsoilqua
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