TY  - BOOK
AU  - Helweg Otto J
TI  - Water resources: Planning and management   
SN  - 0471047708
U1  - X9(D2):8, M5 
PY  - 1985///
CY  - New York
PB  - John Wiley        
KW  - Engneering
N1  - Appendix P 311-350
ER  -