TY  - GEN
TI  - Looking back: looking ahead : five decades of challenges and achivements in environmental sanitation and health
SN  - 9241590831
U1  - 363.7 
PY  - 2003///
CY  - Geneva
PB  - WHO
KW  - ENVIRONMENTAL HEALTH
KW  - Sanitation - history
KW  - Sanitation trends
KW  - Water supply
ER  -