The society published the yearbook Cassiopeia during the years 1939-1968. It featured many high-quality articles and for a long time, Lundmark himself was the main contributor. The annual book, however, became an increasingly heavy economic burden. From 1969, the members instead received the quarterly Astronomisk Tidsskrift ("Astronomocal Magazine") from the Swedish Astronomical Society. In turn, this has been superceded by Populär Astronomi ("Popular Astronomy"), since No. 3, 2001.
Here are some pages from the very first yearbook, from 1939. Here is a description of how the society came into being (Swedish only).
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