Analog was (and probably still is) a science fiction / fantasy (heavier on the science fiction) monthly magazine. There was also some actual science that couldn't find a publisher elsewhere (e.g., continental drift).

Often novels would come out in serialized form, a chapter or three at a time. That's where I first encountered Dune, as a... sophomore(?) in High school. I was pretty blown away, particularly as I'd read T.E. Lawrence's 'Revolt in the Desert' the year before - and that prompted me to plow through the Quran, and most of the Prophet's recorded sayings available in English (the 'Hadiths').

Dune felt like it had come straight out of that pre-WWI Middle Eastern world, or even pre-Prophet.