A subscription to the Donauland publishers was a big deal back then...RD was the only mail my grandmother was really excited over.
You got those monthly RD booklets, which I always found highly interesting, and you had to order a hardback quarterly, otherwise they shipped you one of their Reader's Digest selection books by default:

Four (compressed) novels in one book, my "first contact" with world-literature if you will
And everyone's living room bookshelves were full with them











