Astronomy and Astrophysics Abstracts is devoted to the recording, summ arizing and indexing of astronomical publications throughout the world . Two volumes are scheduled to appear per year. Volume 72 records 12,5 63 papers covering besides the classical fields of astronomy and astro physics such matters as space flights related to astronomy, lunar and planetary probes and satellites, meteorites and interplanetary matter, X-rays and cosmic rays, quasars and pulsars. The abstracts are classi fied under more than one hundred subject categories thus permitting qu ick surveying of the bulk of...