How many movies have James Hartnett and Merian C. Cooper collaborated on?

They have worked on 4 movies together! Their first movie together was The Phantom of Crestwood (1932) while their highest rated movie together was Aggie Appleby, Maker of Men (1933). They have not worked together since Aggie Appleby, Maker of Men (1933). They are most known for their romance films together.