http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
International encyclopedia of sustainable development
5v. v.1, land management.-v.2, Water management.-v.3, Sustainable living.-v.4, Sustainable industry.-v.5, Sustainable tourism
Sustainable development-environmental aspects
Sustainable development-economic aspects