http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Papers of the ... World Clean Air and Environment Congress
World Clean Air and Environment Congress.
National Association for Clean Air (South Africa)
International Union of Air Pollution Prevention and Environmental Protection Associations
Sponsored by: The International Union of Air Pollution Prevention Associations.
Proceedings of the ... World Clean Air Congress
World Clean Air & Environment Congress and Exhibition