Magic Tree House (R) 27 collection Books in one ( Box Set): Mary Pope Osborne: Amazon.com: Books,Magic Tree House Classic Collection 1-28 Books Set: Mary Pope Osborne: 0643459778177: Amazon.com: Books,Amazon.com: Magic Tree House Books 25-28 Boxed Set: 9780399549564: Osborne, Mary Pope: Books,Dinosaurs Before Dark (Magic Tree House, No. 1): Mary Pope Osborne, Sal Murdocca: 9780439238922: Amazon.com: Books,Magic Tree House Collection: Books 25-32: Stage Fright on a Summer Night; Good Morning, Gorillas; Thanksgiving on Thursday; and More,