Thanks for your reply's! The mankind's Serach for God publication is one of the less WTS books I did not throw away. I can't trow it away. There is a reason: it fascinated me when I was a active JW. For the first time I thought that "our" organisation was interested in other religions (...). It was written differently the normal WTS publications.
I have the same feeling about the "Happiness" book and the "James" book. They are still on my bookshelf. Because they are different.
Gorby