How many movies have Hoyt Curtin and William Hanna collaborated on?

They have worked on 15 movies together! Their first movie together was Alice in Wonderland or What's a Nice Kid Like You Doing in a Place Like This? (1966) while their highest rated movie together was The Adventures of Robin Hoodnik (1972). They have not worked together since The Flintstones: On the Rocks (2001). They are most known for their animation films together.