Can someone give me a list of old books Disney turned into movies?

Old Yeller was a book, 101 Dalmatians was a book, Bambi was a book, The Parent Trap was based on a French novel. Swiss Family Robinson, Journey to the Center of the Earth, 20,000 Leagues Under the Sea, and The Legend of Sleepy Hollow all pop to mind. If you are wondering about a specific movie you can check it on IMDB and you should be able to find out if it was based on a book (check the writing credits).