TY  - BOOK
AU  - Pons, L. J. 
AU  - Zonneveld, I. S.
TI  - Soil ripening and soil classification
PY  - 1965///
CY  - Wageningen : 
PB  - International Institute for Land Reclamation and Improvement, 
KW  - GEOLOGIA
KW  - CLASIFICACION DE SUELOS
ER  -