http://esa.un.org/iys/docs/san_lib_docs/guidelines_on_municipal_wastewater_english.pdf

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Guidelines on Municipal Wastewater Management : a practical guide for decision-makers and professionals on how to plan, design, and finance appropriate and environmentally sound municipal wastewater discharge systems, version 3.

http://esa.un.org/iys/docs/san_lib_docs/guidelines_on_municipal_wastewater_english.pdf