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1997

Autor: Helmer, Richard Hespanhol, Ivanildo World Health Organization
Enlace original: https://apps.who.int/iris/handle/10665/41967

Organización Mundial de la Salud
Enlace permanente

Helmer, Richard ,  Hespanhol, Ivanildo ,  World Health Organization ,  [Water pollution control : a guide to the use of water quality management principles]
1984

Autor: Helmer, Richard World Health Organization. Prevention of Environmental Pollution Unit International Drinking Water Supply and Sanitation Decade Inter-Regional Meeting on Rural Water Supply and Sanitation (1984 : Umea, Sweden)
Enlace original: https://apps.who.int/iris/handle/10665/61523

Organización Mundial de la Salud
Enlace permanente
Helmer, Richard ,  World Health Organization. Prevention of Environmental Pollution Unit ,  International Drinking Water Supply and Sanitation Decade ,  Inter-Regional Meeting on Rural Water Supply and Sanitation (1984 : Umea, Sweden) ,  [Water quality, health and the Decade : reflections on a new programme approach / Richard Helmer]
1991

Autor: Lloyd, Barry Helmer, Richard World Health Organization United Nations Environment Programme
Enlace original: https://apps.who.int/iris/handle/10665/40052

Organización Mundial de la Salud
Enlace permanente
Lloyd, Barry ,  Helmer, Richard ,  World Health Organization ,  United Nations Environment Programme ,  [Surveillance of drinking water quality in rural areas / Barry Lloyd, Richard Helmer]
1991

Autor: Lloyd, Barry Helmer, Richard World Health Organization United Nations Environment Programme
Enlace original: https://apps.who.int/iris/handle/10665/40052

Organización Mundial de la Salud
Enlace permanente
Lloyd, Barry ,  Helmer, Richard ,  World Health Organization ,  United Nations Environment Programme ,  [Surveillance of drinking water quality in rural areas / Barry Lloyd, Richard Helmer]
1997

Autor: Helmer, Richard Hespanhol, Ivanildo World Health Organization
Enlace original: https://apps.who.int/iris/handle/10665/41967

Organización Mundial de la Salud
Enlace permanente

Helmer, Richard ,  Hespanhol, Ivanildo ,  World Health Organization ,  [Water pollution control : a guide to the use of water quality management principles]
1984

Autor: Helmer, Richard World Health Organization. Prevention of Environmental Pollution Unit International Drinking Water Supply and Sanitation Decade Inter-Regional Meeting on Rural Water Supply and Sanitation (1984 : Umea, Sweden)
Enlace original: https://apps.who.int/iris/handle/10665/61523

Organización Mundial de la Salud
Enlace permanente
Helmer, Richard ,  World Health Organization. Prevention of Environmental Pollution Unit ,  International Drinking Water Supply and Sanitation Decade ,  Inter-Regional Meeting on Rural Water Supply and Sanitation (1984 : Umea, Sweden) ,  [Water quality, health and the Decade : reflections on a new programme approach / Richard Helmer]

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