How many movies have Gaspar 'Indio' González and José Robert collaborated on?

They have worked on 4 movies together! Their first movie together was Twenty Paces to Death (1970) while their highest rated movie together was Dig Your Grave Friend... Sabata's Coming (1971). They have not worked together since Los Kalatrava contra el imperio del karate (1974). They are most known for their western films together.