Նորմալ դիտում MARC դիտում ISBD Դիտում

Looking back: looking ahead : five decades of challenges and achievements in environmental sanitation and health. - Geneva : World Health Organization, 2003. - 20 p. ill. ; 23 cm.

ISBN: 92 4 159083 1

Subjects--Topical Terms:
Sanitation--history
Sanitation--trends
Water supply
Environmental health