TY  - BOOK
ED  - E.U.A. Department of Agriculture
TI  - Soil survey laboratory methods manual
T2  - Soil survey investigations report
U1  - 631.44 
PY  - 1992///
CY  - [Washington, DC]
PB  - National Soil Survey Center
KW  - Suelos
KW  - Análisis
KW  - Clasificación
KW  - Manuales de laboratorio
KW  - Química de
ER  -