What books did C.S. Lewis write besides The Chronicles of Narnia?

Beyond The Chronicles of Narnia, C.S. Lewis authored approximately 40 books. Many of these works focus on Christian apologetics, including notable titles such as The Screwtape Letters and Mere Christianity. His early writings also included poetry collections like Spirits in Bondage and a narrative poem titled Dymer, published under the pseudonym Clive Hamilton. Lewis also penned scholarly works, such as The Allegory of Love: A Study in Medieval Tradition, and his science-fiction trilogy, comprising Out of the Silent Planet, Perelandra, and That Hideous Strength.1