There is a whole long and interesting backstory regarding this situation, and Bantam's creative way of thwarting another publisher wanting to take advantage of some of the older short stories not being protected by copyright.

The 80's Bantam editions LAW OF DESERT BORN, THE HILLS OF HOMIDICE and two large volumes of collected pulp novels TRAIL TO CRAZY MAN and RIDER OF THE RUBY HILLS were published to circumvent publisher Carroll & Graf's planned editions, each with a little badge on the cover stating they were the "only authorized editions". Bantam beat them to the punch with a better product, supported by the author.

I suspect most of us bought only the Bantam editions in support of LL. I know I did.