TY  - BOOK
AU  - Villegas,L.M.
AU  - Calabio,J.
TI  - Soil sampling
T2  - Rice Production Training Series
AV  - S593 V55 
PY  - 0000///[Date of publication not identified]
CY  - Los Banos
PB  - International Rice Research Institute
KW  - Soils
KW  - Sampling
ER  -