TY  - BOOK
AU  - Otto J. Helweg
TI  - Water resources : planning and management
U1  - 551.49 
PY  - 1985///
CY  - New York
PB  - John Wiley and Sons
N1  - Otto J. Helweg: Water resources : planning and management.  New York.  John Wiley and Sons, 1985.--(551.49HEL)
ER  -