Water and waste engineering in Africa : 6th WEDC conference 24, 28 March 1980 at Ahmadu Bello University, Zaria, Nigeria : proceedings /
WEDC Conference(6th :1980 :Zaria)
Pickford, John,1924-
Ball, Susan,1950-
Loughborough Department of Civil Engineering, University of Technology
1981
Water-supply
Sewage disposal