Here is the list of Beatrix Potter's books in order-
Book 1: The Tale of Peter Rabbit (1902)
Book 2: The Tale of Squirrel Nutkin (1903)
Book 3: The Tailor of Gloucester (1903)
Book 4: The Tale of Benjamin Bunny (1904)
Book 5: The Tale of Two Bad Mice (1904)
Book 6: The Tale of Mrs. Tiggy-Winkle (1905)
Book 7: The Tale of The Pie and the Patty-Pan (1905)
Book 8: The Tale of Mr. Jeremy Fisher (1906)
Book 9: The Story of a Fierce Bad Rabbit (1906)
Book 10: The Story of Miss Moppet (1906)
Book 11: The Tale of Tom Kitten (1907)
Book 12: The Tale of Jemima Puddle-Duck (1908)
Book 13: The Tale of Samuel Whiskers (1908)
Book 14: The Tale of the Flopsy Bunnies (1909)
Book 15: The Tale of Ginger and Pickles (1909)
Book 16: The Tale of Mrs. Tittlemouse (1910)
Book 17: The Tale of Timmy Tiptoes (1911)
Book 18: The Tale of Mr. Tod (1912)
Book 19: The Tale of Pigling Bland (1913)
Book 20: Appley Dapply's Nursery Rhymes (1917)
Book 21: The Tale of Johnny Town-Mouse (1918)
Book 22: Cecily Parsley's Nursery Rhymes (1922)
Book 23: The Tale of Little Pig Robinson (1930)
Hope this helps!