Reynard
aka Ian Eller
I think it is pretty cvlear that what we are talking about here are things like Sword and Fist. Only 3.0 did that.The 4e preview books were player-facing, as were some of the digest-sized books. The preview books were pretty short. Maybe not the digest-sized ones, but they would've been a lot shorter if they'd been full size ...
Murder in Baldur's Gate and Legacy of the Crystal Shard each came as two short soft-cover booklets wrapped in a DM screen. One booklet was the adventure, the other was a gazetteer. The gazetteers could be shown to the players.
So, yes?