what year was dr.seuss book first published
The first Dr. Seuss book is And to think I saw it on Mulberry Street. It was published in 1937. The second book is The 500 Hats of Bartholomew Cubbins published in 1938. In the second book, Dr. Seuss introduces the characters King Derwin and Bartholomew Cubbins. He reprises them in Bartholomew and the Oobleck(1949).