I noticed while checking my Graphic Novels and Hardcovers to make sure they were in the core that you don’t have the Hardcover of Batman Son of the Demon listed as a key. You list the Trade Paperback of the story that came out later that year as a key for the 1st app of Baby Damian Wayne. The Hardcover came out in early 1987 and doesn’t have this listed as a key.
Hi, we generally don’t add keys to TPB’s or HC’s. There are a few exceptions when a book is comic size or not the normal TPB size. This is more in line with Marvel’s Graphic Novel series which is why this was only added the Graphic Novel Edition and why it will remain that way. Hope this answers your question 