TY  - BOOK
AU  - Ridder, N.A. 
TI  - Optimum use of water resources
U1  - 333.91 21st ed.
PY  - 1977///
CY  - Wageningen
PB  - International Institute for Land Reclamation and Improvement
KW  - Groundwater
KW  - Irrigation
KW  - Water resources development
KW  - Water-supply
KW  - Water-supply, Agricultural
N1  - 243-49 includes index
ER  -