1989 AZ
1989 AZ.
1989 BV Photoelectric Observations of BV Dra
1989 BV Photoelectric Observations of BW Dra
1989 BV Photoelectric Observations of CG Cyg
1989 BVR Light Curves of RT And
1989 BVR Photometry of CG Cygni
1989 Comet Handbook
1989 DA
1989 DA
1989 DA
1989 DA
1989 DA
1989 DA
1989 DA.
1989 December 8 (meeting)
1989 December 8 meeting of the Royal Astronomical Society
1989 FB
1989 FB
1989 FB