19894 November 28 meeting of the British Astronomical Association
1989: topjaar voor het noorderlicht.
1989M - supernova in NGC 4579 (=M58).
198ampella
198th Meeting of the American Astronomical Society
199 Byblis CCD Spectrum
1990 and 1991 Photometry of UZ Librae
1990 and 1991 UBVRI Photometry of FK Comae
1990 and 1991 UBVRI Photometry of HD 199178 = V1794 Cyg
1990 annual statistics and highlights report.
1990 April 5 (meeting)
1990 BA
1990 BA
1990 BA
1990 BG
1990 BG
1990 BG
1990 BV Photoelectric Observations of CG Cyg
1990 BVR Photometry of XY UMa
1990 Comet Handbook