Just to give you an idea of how agile a working writer had to be in the age of disposable paperback originals, here’s three examples… A licensed western, a science-fiction original, and a sleazy men’s adventure series– all three by the same guy, Paul Fairman. Pen names were common practice, especially if you didn’t want your new publisher to know you also created THE MAN FROM S.T.U.D. [Edit: Greg provided guidance, so while I’m not positive the second and third images were what he used, it seems like a good guess!]