by Gideon Marcus
I recently discovered the goodness that is the ACE Double. For just 35 cents (or 45 cents, depending on the series), you get two short books back to back in one volume. I've been impressed with these little twinned novels though their novelty may pass as I read more magazine scientificition – after all, many of the ACE novels are adapted magazine serials. Still, they've been a great way to catch up on good fiction I've missed.
For instance, ACE Double D-485 (released Spring 1961) pairs Lloyd Biggle Jr.'s The Angry Espers with Robert Lowndes' The Puzzle Planet.
(see the rest at Galactic Journey!)