Mary Pope Osborne

Magic Tree House 1: Valley of the Dinosaurs

Magic Tree House 2: Castle of Mystery

Magic Tree House 5: Night of the Ninjas

Magic Tree House 3: Secret of the Pyramid

Magic Tree House 4: Pirates' Treasure!

Magic Tree House 6: Adventure on the Amazon

Magic Tree House Collection: Books 1-8 (Unabridged)

Magic Tree House: Books 1 and 2: Dinosaurs Before Dark, The Knight at Dawn (Unabridged)

Magic Tree House Collection: Books 17-24 (Unabridged)

Magic Tree House Collection: Books 9-16: #9: Dolphins at Daybreak; #10: Ghost Town; #11: Lions; #12: Polar Bears Past Bedtime; #13: Volcano; #14: Dragon King; #15: Viking Ships; #16: Olympics (Unabridged)

Merlin Missions Collection: Books 1-8: Christmas in Camelot; Haunted Castle on Hallows Eve; Summer of the Sea Serpent; Winter of the Ice Wizard; Carnival at Candlelight; and more (Unabridged)

Dinosaurs Before Dark (Unabridged)