1983 ad for the Asterix in Belgium softcover and related competition (closing date 30 June 1983).
This was the 24th Asterix adventure and the last written by Rene Goscinny. He died in 1977, part of the way through writing the story, and the remainder was completed by Albert Uderzo. I think Asterix's reference to there being 27 adventures must be because by the time this came out in softcover there were three more books released with Uderzo having taken over the writing duties as well.
The final panel of the book shows a sad-faced rabbit looking at Goscinny's name.










