Question: what old books are worth money?
Answer: Harry Potter and the Philosopher's Stone (1997), J.K. Rowling. The Cat in the Hat (1957) Dr. ...  The Hound of the Baskervilles (1902), Arthur Conan Doyle. The Bible (1600 – 1630) The Jungle Book and The Second Jungle Book (1894-1895) Rudyard Kipling: