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Biblio
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Helmer, R.
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1999
I. Hespanhol
and
Helmer, R.
,
“
Control de la contaminacion del agua : guia para la aplicacion de principios relacionados con la calidad del agua
”
. CEPIS (Centro Panamericano de Ingenieria Sanitaria y Ciencias del Ambiente), Lima, Peru, p. xvi, 546 p. : fig., tab., 1999.
1997
I. Hespanhol
and
Helmer, R.
,
Water pollution control : a guide to the use of water quality management principles
. London, UK: E & FN Spon, 1997, p. xvi, 510 p. : boxes, fig., maps, tab.
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