http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Improved production systems as an alternative to shifting cultivation
Food and Agriculture Organization of the United Nations
Soil Resources, Management, and Conservation Service.
xiv, 201 pages : illustrations, maps ; 30 cm.
Soils Resources, Management and Conservation Service ; Land and Water Development Division.