Astronomy and astrophysics abstracts. - Vol 50A. literature 1989, part 2 - Burkhardt, G. B.; International Astronomical Union (Berlin : Springer-Verlag, 1990)
Some volumes issued in parts called A and B; each vol. covers literature for part of year, with final vol. covering pt. 1 of 2000.
Keywords: Astronomy. -- Abstracts; Astrophysics. -- Abstracts