Goodreads Librarians Group discussion

In Peter O'Donnell's work, there are two with the same title (The Black Pearl), one pub in 1978 by Star and one pub in 2005 by Titan. They do not contain the same stories so I tried to separate them. But I seem to have lost the 1978 Star one, though the Titan one is still on the list. What did I do wrong?

Also, there are two books on his list that are by another Peter O'Donnell. How do I go about finding out which PO'D is which while I'm on "my" PO'D's list?

Thanks for help.

Thanks. I'll go look again.