How many movies have Gil Iverson and Larry C. Cowan collaborated on?

They have worked on 4 movies together! Their first movie together was Yogi's First Christmas (1980) while their highest rated movie together was Yogi Bear and the Magical Flight of the Spruce Goose (1987). They have not worked together since Jetsons: The Movie (1990). They are most known for their animation films together.