Affordable Water Supply and SanitationJohn Pickford, Peter Barker, Adrian Load, Tom DijkstraHäftad, 1995255 kr
Guide to the Development of On-site SanitationRichard Franceys, John Pickford, R. ReedHäftad, 1992416 kr
Affordable Water Supply and SanitationJohn Pickford, Peter Barker, Adrian Load, Tom DijkstraHäftad, 1995255 kr