Titles in this set:1. Valley of the dinosaurs2. Castle of mystery3. Secret of the pyramid4. Pirates' treasure 5. Night of the ninjas6. Adventure on the amazon7. Mammoth to the rescue8. Moon mission9. Diving with dolphins10. A wild west ride11. Lions on the loose12. Icy escape13. Racing with gladiators14. Palace of the dragon king15. Voyage of the vikings16. Olympic challenge condition : brand newformat : paperbackisbn: 9781529908022 about the author:widely regarded among parents, teachers, and librarians for its power to instill a passion for reading, mary pope osborne’s award-winning, 1 new york times best selling magic tree house series is an international phenomenon and has sold more than 134 million books worldwide since its debut in 1992. The books have been translated into 33 different languages in over 30 international markets. All magic tree house books are available in print, as ebooks and listening library audio books, which are all narrated by mary pope osborne. Visit www.Magictreehouse.Com for more information about the series, activities, and more. Mary pope osborne is an ardent advocate and supporter of children’s literacy, and the award-winning author of more than 100 books for children and young adults, including novels, retellings of mythology and folklore, picture books, biographies, and mysteries. From 1993 1997, ms. Osborne served as president of the authors guild, the country’s leading organization for published authors. She has traveled extensively i...