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		Surveillance of drinking water quality in rural areas / Barry Lloyd, Richard Helmer. by Lloyd, Barry \| Helmer, Richard \| World Health Organization \| United Nations Environment Programme. Material type: Text; Format: print Publication details: Essex : Longman Scientific & Technical, 1991Availability: Items available for loan: WHO HQ (2)Call number: WA 675 91LL, ... Place hold Add to cart (remove)
		Water pollution control : a guide to the use of water quality management principles / edited by Richard Helmer and Ivanildo Hespanhol. by Helmer, Richard \| Hespanhol, Ivanildo \| World Health Organization. Material type: Text; Format: print Publication details: London : E & FN Spon, 1997Online access: Click here to access online Availability: Items available for loan: WHO HQ (3)Call number: WA 689 97WA, ... Place hold Add to cart (remove)

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