The Stanislaw Lem site is running a contest where you can win an autographed copy of one of his books. A series of Lem's books have just been published in Turkey. The contest is to guess the books just from the covers. I think I can do well. This is a wonderful puzzle!
I should note that I have scanned the covers of all my Lem books as submissions for Lem's site. It ain't pretty, but it wasn't built for you.