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Herdina Rahayu, Lanawati and , Dwi Astuti, SKM., M.Kes and , Sri Damoto, SKM., MPH. (2015) Keefektifan Variasi Dosis Pac(Poly Aluminium Chloride) Dalam Menurunkan Kadar Amonia Air Limbah Industri Penyamakan Kulit Di Magetan. Skripsi thesis, Universitas Muhammaiyah Surakarta.