When did Horizon Season 4 Episode 20 air?
Horizon Season 4 Episode 20 aired on November 17, 1967.
Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 4 · Episode 20
Air Safety: The Unknown Factor
Nov 17, 1967·1h
Horizon investigates air navigation and flight safety.
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Direct answers for episode-level questions and details.
How long is Horizon Season 4 Episode 20?
This episode runs for approximately 60 minutes.
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