TY  - BOOK
AU  - Webster R
TI  - Quantitative and numerical methods in soil classif
T2  - Monographs on Soil Survey
U1  - J:1:(B28), L7 
PY  - 1977///
CY  - Oxford
PB  - Clarendon Press         
KW  - Agriculture
N1  - Appendix p.244-50
ER  -