IIRC, the folders contain the adventure, as well as a sheet listing other products available from Mayfair (similar to the Minifigs listing that goes into some printings of the
GH folio). I'm away from my books, though, so someone else is likely to confirm/deny prior to my return to them tomorrow night.
I'm still looking for a copy of Blasted Land, and would be happy to trade if you have that
