This great, pocket-sized Mexican edition was published by Editorial Novaro. It features Challengers of the Unknown #84 To Save a Monster/When Deadmen Walk, originally printed in 1978.
I believe Los Temerarios translates to The Reckless. For a refresher on this Challengers #84 see my previous post here.
The book also features Superboy #65 The Super-Weakling from Space