http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Proceedings of the Third International Clean Air Congress, Dusseldorf ... 1973
International Clean Air Congress 1973 : Dusseldorf)
International Union of Air Pollution Prevention Associations
1 volume (various pagings) : illustrations ; 30 cm.
Sponsored by the International Union of Air Pollution Prevention Associations, hosted by VDI-Kommission Reinhaltung der Luft.