Campy sci-fi book series published in Spanish throughout the 1970s, as seen on Mundo Bocado. Many more examples, complete with art and design credits, at Le Tercera Fundación.
Photo by Lars Schwarz on Flickr.
Contributed by Stephen Coles
Contributed by Nick Sherman
Contributed by Font Bureau
Photo by Sergiy Tkachenko on Flickr.
Contributed by Florian Hardwig