TY  - BOOK
AU  - Kogel R G
AU  - Kogel, R G
AU  - Kogel R G
TI  - Shelf-help wells FAO irrigation and Drainage paper No. 30
U1  - 632.7/KOG 
PY  - 1977///
CY  - Rome
PB  - FAO
KW  - Irrigation
ER  -