Westerns:
- Pat Garrett and Billy the Kid (1973)
- Junior Bonner (1972)
- Ballad of Cable Hogue, The (1970)
- Wild Bunch, The (1969)
- Glory Guys, The (1965)
- Major Dundee (1965)
- Ride the High Country (1962)
- Deadly Companions, The (1961)
- "Westerner, The" (1960)
- "Rifleman, The" (1958)
- "Trackdown" (1957)
- "Broken Arrow" (1956)
- "Zane Grey Theater" (1956)
- "Gunsmoke" (1955)
Academy Awards/Nominations: Nominated Best Writing, story, screenplay - The Wild Bunch (1970)