Impressions from the XXI IAU General Assembly. Baade, D. ; Merkle, F. ; Traat, P. ; Sterken, C. ; Grosbøl, P. ; Rosa, M. ; Madsen, C. ; Warmels, R. ; van der Laan, H. Abstract Publication: The Messenger Pub Date: September 1991 Bibcode: 1991Msngr..65...17B