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1. Upgrading of biological filter sewage purification processes for phosphate and nitrogen removal / Herman N. S. Wiechers, Andries S. Louw, Nick C. Thirion, Karian E. U. BrodishPublication: [S.l.] : 1984, [s.n.]Description: p. 205-210 : il. ; 30 cmAvailability: Items available for loan: Biblioteca de Algés[03861-S] (1).

2. Upgrading of biological filter sewage purification processes for phosphate and nitrogen removal / Herman N. S. Wiechers, Andries S. Louw, Nick C. Thirion, Karin E. U. BrodischPublication: [S.l.] : 1984, [s.n.]Description: p. 205-210 : il. ; 30 cmAvailability: Items available for loan: Biblioteca de Algés[03861-S] (1).

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