Elvis Presley The Beatles art print

I picked this item at my local Salvation Army store in Burley, Idaho. I'm not sure how much it is worth. Not in mint condition, but not in bad condition either, after a little research, I found out that this an advertising poster for an illustrated biography ( basically a comic book) for the book Evis Presley/ the Beatles, printed in 1979 by Pendulum Press Inc. out of New Haven Connecticut. Lots of info on the book, but zero info about the poster itself, leading me to believe it might be worth something, at least the 2 dollars I dropped for it! Unknown who the artist is, as the art is not signed, probably as this was an advertising poster that wanted to emphasize on the book content and not who drew it.