What is the name of C.S. Lewis’s first Narnia novel by publication order?

The first Narnia novel published by C.S. Lewis was The Lion, the Witch and the Wardrobe. It appeared in 1950 and introduced readers to the magical land of Narnia through a wardrobe in an English country house.

The story follows Peter, Susan, Edmund, and Lucy Pevensie. Lucy discovers Narnia first, and the children become involved in a conflict involving Aslan, the White Witch, and the permanent winter imposed on the land.

The book was the first published volume of The Chronicles of Narnia, although many modern editions number The Magician’s Nephew first because it describes earlier events in Narnian history.

That difference creates two reading orders: publication order and internal chronological order. The question asks for publication order, in which The Lion, the Witch and the Wardrobe comes first.