How many movies have Mia May and Ruth Goetz collaborated on?

They have worked on 13 movies together! Their first movie together was Nebel und Sonne (1916) while their highest rated movie together was The Mistress of the World, Part VIII: The Revenge of Maud Fergusson (1920). They have not worked together since Der Amönenhof (1920). They are most known for their drama films together.