TY  - BOOK
AU  - World Health Organization
TI  - Operation and maintenance of urban water supply and sanitation systems: a guide for managers: Operation and maintenance of urban water supply and sanitation systems: a guide for managers
SN  - 92-4154471-6.
U1  - 628.1, 
PY  - 1994///
CY  - Geneva
PB  - WHO
ER  -