written by (42 episodes, 1969-1974)
additional material (1 episode, 1969)
conceived and written by (1 episode, 1969)
creator (1 episode, 1973)
written by (43 episodes, 1969-1974)
written by (40 episodes, 1969-1974)
written by (39 episodes, 1969-1974)
written by (2 episodes, 1974)
written by (1 episode, 1974)