Very much a hey, look at this post, this. I’ve just seen a link to this collection on Things Magazine of Pelican Books covers for the 1960s (and each decade they were published). It’s interesting to see how the template developed along with the Penguin series until it all got a bit chaotic in the late ’70s and was discontinued in the 1980s. Joe Kral also maintains a collection of Penguin and Pelican covers on Flickr.