I tried to get an ID on this one a couple of years ago, but Typophile uncharacteristically drew a blank. I found it again looking through some old picture folder on my hard drive, and wonder if I may be luckier in the new system?

It's from a paperback book cover I saw at my parents' house, published sometime in the 70s as far as I recall. I'm looking for the authors' names' typeface, not the big one in the middle.