written by (25 episodes, 1971-1976)
written by (15 episodes, 1971-1973)
written by (12 episodes, 1971-1974)
writer (1 episode, 1974)
written by (11 episodes, 1971-1976)
written by (8 episodes, 1974-1976)
written by (3 episodes, 1974-1976)
written by (1 episode, 1971)
with (1 episode, 1974)
written by (1 episode, 1974)