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1. Steam distillation methods for determination of ammonium, nitrate and nitrite [Texto fotocopiado] by J. M. Bremner and D. R. Keeney Publication: [S.l.] 1965 [s.n.] . 11 p. 21 cm Availability: Items available: Biblioteca de Algés (1),

2. Nitrogen cycling in Lake Wingra [Texto fotocopiado] by N. O. Isirimah, D. R. Keeney, and E. H. Dettmann Publication: [S.l.] 1976 [s.n.] . [7] p. 30 cm Availability: Items available: Biblioteca de Algés (1),

3. The nitrogen cycle in sediment-water systems [Texto fotocopiado] by D. R. Keeney Publication: [S.l.] 1973 [s.n.] 30 cm Availability: Items available: Biblioteca de Algés (1),

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