Polar Bears Past Bedtime (Magic Tree House, No. 12)
(Magic Tree House #12)
written by Mary Pope Osborne with illustrations by Sal Murdocca

• Publication Date: January 12, 1998
• Genres: Children's, Historical Fantasy
• Paperback: 96 pages
• Publisher: Random House Books for Young Readers
• ISBN-10: 067988341X
• ISBN-13: 9780679883418