TY  - BOOK
ED  - World Health Organization.
TI  - Looking back : looking ahead: five decades of challenges and achievements in environmental sanitation and health
SN  - 9241590831
PY  - 2003///
CY  - Geneva
PB  - World Health Organization
KW  - World Health Organization
KW  - Sanitation
KW  - history
KW  - trends
KW  - Water supply
KW  - Environmental health
UR  - http://apps.who.int/iris/
ER  -