Bioastronomy - The Next Steps: Proceedings of the 99th Colloquium of the International Astronomical Union held in Balaton, Hungary, June 22–27, 1987

The Solar Spectrum: Proceedings of the Symposium held at the University of Utrecht 26–31 August 1963

The Cosmic Microwave Background: 25 Years Later: Proceedings of a Meeting on ‘The Cosmic Microwave Background: 25 Years Later’, Held in L’Aquila, Italy, June 19–23, 1989

Dusty Objects in the Universe: Proceedings of the Fourth International Workshop of the Astronomical Observatory of Capodimonte (OAC 4), Held at Capri, Italy, September 8–13, 1989

Observatories in Earth Orbit and Beyond: Proceedings of the 123RD Colloquium of the International Astronomical Union, Held in Greenbelt, Maryland, U.S.A., April 24–27,1990

Comets in the Post-Halley Era: In Part Based on Reviews Presented at the 121st Colloquium of the International Astronomical Union, Held in Bamberg, Germany, April 24–28, 1989