TY  - BOOK
ED  - Unesco
ED  - International Hydrological Decade.
ED  - Unesco
TI  - Teaching aids in hydrology
PY  - 1972///
CY  - Paris
PB  - Unesco
KW  - Hydrology
KW  - Study and teaching
N1  - At head of title: A contribution to the International Hydrological Decade
ER  -