Refine Your Search
Book List
2
-
Ventilated improved pit latrines : vent pipe design guidelines / by Beverly A. Ryan and D. Duncan Mara.
- World Bank,
- cop. 1983.
- Washington, DC :
-
Pit latrine ventilation : field investigation methodology / by Beverly A. Ryan and D. Duncan Mara.
- World Bank,
- cop. 1983.
- Washington, DC :