Which Oz movie is the most faithful to the source material?

1939’s The Wizard of Oz is one of the most beloved movies of all time. However, is it the most faithful to the Oz series of books by L. Frank Baum? I know some people will disagree. There have been numerous adaptations of the Oz books including various silent films, 1985’s Return to Oz, and 2013’s Oz the Great and Powerful. If there are any other TV shows, cartoons, shorts, etc. that you find are most faithful to the books, list them if you can. Note: HBO’s Oz doesn’t count!