The Magic Tree House series, a total of 32 volumes. - Series Name: Magic Tree House - Volumes: 1, 9, 12, 14, 15, 23, 26, 28, 29, 30, 31, 32, 33 - Author: Mary Pope Osborne - Language: Japanese - Genre: Children's Books There are scuffs on the spines and yellowing and stains due to aging. There are no problems with reading. Thank you for looking.