In 2017 Random House Renumbered books 29-55 of the Magic Tree House series to create a separate series called Merlin Missions.
Quickly and easily update your Magic Tree House collection with the new Merlin Mission Number!
This Document contains 2 pages of labels. The 1st page contains labels numbered 1-29 along with two series stickers to label your bookshelves, book bins or whatever you use to store your collection. Have 2 copies of each book in your library? Just print 2 pages!
Don't need a complete set of labels? Just print the 2nd blank page and write-in the numbers in the spaces provided. (I recommend using a fine tip sharpie)
I have also created a free mini-poster that list the old and new numbers for each title.
Magic Tree House: Merlin Mission List