http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
750 páginas ; : ilustraciones, diagramas ; 24 cm.
Some important physical properties of mineral soil -- Sail air and soil temperature -- Organisms of the soil -- Nitrogen and sulfur economy of soils -- Micronutrient elements -- Soil erosion its control -- Soil and chemical pollution