Check out the top 15 children’s book series and tie-ins sold in the US over the last month, courtesy of our friends at Publishers Weekly.

1. Twilight Sage, by Stephanie Meyer, Little, Brown/Tingley

2. Harry Potter, by J.K. Rowling, Scholastic/Levine

3. Magic Tree House, by Mary Pope Osborne, Random House

4. Percy Jackson and the Olympians by Rick Riordan, Hyperion/Miramax

5. Uglies Series, by Scott Westerfeld, Simon Pulse

6. High School Musical by N.B. Grace, Disney

7. His Dark Materials by Philip Pullman, Knopf

8. The It Girl by Cecily von Ziegesar, Little, Brown

9. Junie B. Jones by Barbra Park, Random House

10. Clique by Lisi Harrison, Little, Brown

11. Alex Rider Adventures by Anthony Horowitz, Puffin

12. Gossip Girl by Cecily von Ziegesar, Little, Brown

13. Skippyjon Jones by Judy Schachner, Dutton

14. Warriors by Erin Hunter, HarperCollins

15. The Ranger’s Apprentice by John F. Philomel

Used with permission, copyright Publishers Weekly 2007; a full listing in all categories can be found at www.publishersweekly.com.