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Drinking water quality : problems and solutions / N. F. Gray Monografia Publication Chichester : John Wiley & Sons, imp. 1996 Description XX, 315 p. ; 25 cm LocationBiblioteca Geral da Universidade do Minho, Biblioteca de Engenharia Biológica Availability Available (1). Reference (1).

Biology of wastewater treatment / N. F. Gray Monografia Publication London : Imperial College Press, cop. 2004 Description XVIII, 1421 p. : il. ; 23 cm LocationBiblioteca de Engenharia Biológica Availability Reference (1).