Diseño de letrinas mejoradas de pozo ventilado /

by Duncan Mara, D., Duncan Mara, D.
Published 1984

EcoFlapper : el dispositivo que regulará las descargas en servicios sanitarios /

by López Sedó, María Valeria

Rural ventilated improved pit latrines : a field manual for Botswana /

by Van Nostrand, John, Van Nostrand, John, Wilson, James G.
Published 1983

[Desechos humanos y sus tratamientos /

by Olmos Cifuentes, Esteban, Olmos Cifuentes, Esteban
Published 1973

Ventilated improved pit latrines : recent developments in Zimbalwe /

by Morgan, Peter R., Morgan, Peter R., Mara, David Duncan 1944-
Published 1982