there are many black cat books in my dad's old collection. most of them were published in the 1960's and deal with social or scientific topics pertinent to the time in which they were released. ultraserious titles like drugs and the mind or man against aging--my dad seemed to like those best. what i take from this is that not only are these books badass looking but also potentially dangerously outdated.
this just makes me want to read them more.

note: i've never read any of the above books, but just look at them!
many thanks to gregoreverb, 5m@5hYdez, and tolstoy2007 for the images.

added: these old paperback book covers are everywhere! i'm lost in the internet!