"This edition is available for distribution only through the school market."--Page 4 of cover.
The original Magic Tree House series ceased with volume 28 and starting with volume 29, is continued with the series title The Magic Tree House, Merlin Missions. With the 25th anniversary re-prints of the Merlin Missions, the books have been separated into two separately numbered series, the original Magic Tree House (1-29) and The Magic Tree House, Merlin Missions series starting with #1.
Originally published as Magic Tree House #48.
Summary
Magically transported to southwest China to find the final object needed to break the spell on the wizard Merlin's beloved penguin, Jack and Annie take a side trip to the world's largest giant panda reserve.