In the 1960's I painted a few paperback book covers, mostly science fiction subjects. It was more fun than doing advertising illustrations. However, my main source of income was from advertising work and the deadline demands usually were brutal enough that I had to limit my branching out in other fields. I think that I managed to do about 20 book cover illustrations. The 3 posted here were recently found on line at an internet book store. I lucked out with Dr. Futurity as it was an Ace double with The Unteleported Man on the reverse side. I now wish that I had pursued this field more as I really enjoyed doing these illustrations.