Set of four books from the Magic Tree House series. Titles include #21 Civil War on Sunday, #22 Revolutionary War on Wednesday, #23 Twister on Tuesday, #24 Earthquake in the Early Morning. RL3Set of four books from the Magic Tree House series. Titles include #21 Civil War on Sunday, #22 Revolutionary War on Wednesday, #23 Twister on Tuesday, #24 Earthquake in the Early Morning. RL3