How many story collection books did A. A. Milne create about the teddy bear, Winnie-the-Pooh?

"Winnie-the-Pooh" is a children’s book by English author A. A. Milne and English illustrator E. H. Shepard. Published in 1926, it is a collection of short stories about an anthropomorphic teddy bear, Winnie-the-Pooh, and his friends Christopher Robin, Piglet, Eeyore, Owl, Rabbit, Kanga, and Roo. It is the first of two story collections by Milne about Winnie-the-Pooh, the second being "The House at Pooh Corner" (1928).

Alan Alexander Milne (18 January 1882 – 31 January 1956) was an English author, best known for his books about the teddy bear, Winnie-the-Pooh, and for various poems. Milne was a noted writer, primarily as a playwright, before the huge success of Pooh overshadowed all his previous work. Milne served in both World Wars, joining the British Army in World War I, and as a captain of the British Home Guard in World War II.