Vintage original Choose Your Own Adventure books from the 1980's.  15 included:  TheCave of Time, Your Code Name is Jonah, Who Killed Halloween Throbbed, The Lost Jewels of Nabooti, The Forbidden Castle, Secret of the Pyramids, Space Patrol, The Lost Tribe, Lost on the Amazon, Prisoner of the Ant People, The Phantom Submarine, Vampire Express, The Dragons' Den, War with the Evil Power Master, and Supercomluter.  All books are in pretty solid shape considering their age but should be considered in read condition.  My deceased brother's name may be written in pencil inside some of them.  Note my feedback and bid with confidence.