I had a collection of 60 foreign language "Truth" books back in the days when they were only 25 cents each. I remember that when I ordered a book in a foreign language that was out of print the Watchtower would refund me in postage stamps
It was the book I used in my first study. They used to call it the blue bomb. There was no real need to recycle them into another book but then the Society thrives on pseudo-change.
I dumped them after my disfellowshipping which I now regret. They could have fetched a good price on E bay.