http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Proceedings of IAU Symposium No. 66 held in Warsaw, Poland, September 10-12, 1973
International Astronomical Union/Union Astronomique Internationale, Symposium No. 66 Held in Warsaw, Poland, 10-12 September 1973 ; ; 66