Soil survey laboratory methods manual
National Soil Survey Center
- [Washington] NSSC 1996
- 693 p. 28 cm
- Soil Survey Investigations Report / NSSC. USDA 42, version 3.0 .
- Soil Survey Investigations Report / NSSC. USDA .
Analisis del suelo Investigacion Ciencia del suelo
Analisis del suelo Investigacion Ciencia del suelo