16 pack includes the following titles: Level 17 = Carbon Trading; Fish; The Great Barrier Reef; You Wish. Level 18 = Medieval Medical Care; The Great Plague of London; Weather; Lucky Break. Level 19 = Life in Ancient Rome; Life in Unusual Places; Volcanoes; All Shook Up. Level 20 = Bushfire Ready; Famous Pharoahs; Life in Ancient Egypt; You Never Know.