TY  - GEN
AU  - Ward, R C
TI  - Principles of hydrology/  3rd ed
SN  - 0-07-100638-9
U1  - 626.8 
PY  - 1990///
CY  - London
PB  - McGraw Hill 
KW  - 626.8
KW  - Hydrology
ER  -