Last bookmas clues

The Twelve Days of Bookmas has been fun to play. Or, I haven't actually played, since I haven't been guessing--good thing, because I would never have been able to figure out any of the answers. But I've had fun coming up with clues. Sometimes the appropriate (in my odd mind) clue jumped out at me the moment I saw the answer and sometimes I was, er, clueless.

So here we go, for the last time--the answers to these clues are two children's books.

1. I somehow missed this series, though it looks like my kids could have read it. I don't think they did--at least, I know I didn't read it to them. I had to go to good old Wikipedia to figure out a possible clue. So here it is: I didn't read these books, but I did read--or at least I have a copy of--the two volume set of Le Mort d'Arthur from my college days. Unless Wikipedia lies, there's some connection there.

2. I'm not sure if I read this book by this author or not, but if I did, it wasn't a favorite. I do, however, have two copies of a slim book he co-authored.