Highlights of Astronomy As Presented at the XVth General Assembly and the Extra Ordinary General Assembly of the I.A.U. 1973 Contopoulos G. Innbundet / 1974 / Engelsk
Highlights of Astronomy As Presented at the XVth General Assembly and the Extra Ordinary General Assembly of the I.A.U. 1973 Contopoulos G. Heftet / 2011 / Engelsk
Transactions of the International Astronomical Union Proceedings of the Fifteenth General Assembly Sydney 1973 and Extraordinary General Assembly Poland 1973 Contopoulos G. Heftet / 2011 / Engelsk
Transactions of the International Astronomical Union Proceedings of the Fifteenth General Assembly Sydney 1973 and Extraordinary General Assembly Poland 1973 Contopoulos G. Innbundet / 1974 / Engelsk
Galactic Dynamics and N-Body Simulations Lectures Held at the Astrophysics School VI Organized by the European Astrophysics Doctoral Network (EADN) in Thessaloniki, Greece, 13–23 July 1993 Contopoulos G. Heftet / 2013 / Engelsk
Twenty Years of Ozone Decline Proceedings of the Symposium for the 20th Anniversary of the Montreal Protocol Zerefos Christos Heftet / 2016 / Engelsk
Twenty Years of Ozone Decline Proceedings of the Symposium for the 20th Anniversary of the Montreal Protocol Zerefos Christos Innbundet / 2009 / Engelsk
