Biblio

Occasional paper / FID. .

Occasional paper / Hong Kong Institute of Asia-Pacific Studies. .

“Occasional paper series / BPD Water and Sanitation”. .

Occasional paper series / Development Workshop. Guelph, Ont, Canada: Development Workshop.

Occasional paper series / IRC. .

Occasional paper / Third World Centre. .

Occasional paper / UWEP. Gouda, The Netherlands: WASTE.

Occasional papers / ENDA. .

“Occasional papers / INTRAC”. INTRAC, International NGO Training and Research Centre, Oxford, UK.

Occasional papers of the German Development Institute GDI. .

Occasional papers series / Municipal Services Project. .

Occasional publication / PAHO. Washington, DC, USA: Pan American Health Organization (PAHO).

“October 1990”, Health action. .

“ODI / Water policy programme briefings”. .

ODI/IIMI Agricultural Research and Extension Network (Agren) / network paper. .

ODI/IIMI Irrigation Management Network / network paper. .

OECD documents. .

OECD proceedings. .

“OECD rural policy reviews”. .

“OECD Studies on water”. OECD, Paris, France.

“Oesterreichische Wasser- und Abfallwirtshaft”. Springer Verlag, Vienna, Austria.

Offprint series. .

Offset publications / WHO. .

“Omega”. .

“Operacion y mantenimiento de plantas de tratamiento por filtracion en multiples etapas”. .