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Handbook for district sanitation coordinators
authors: Kebadire Bsaako ... [et al.] ; e...
Bok Engelsk 1983
Rural ventilated improved pit latrines : a field manual for Botswana
John van Nostrand and James G. Wilson
Bok Engelsk 1983
The ventilated improved double-pit latrine: a construction manual for Botswana
John van Nostrand and James G. Wilson
Bok Engelsk 1983