Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 16 · Episode 15 ·
Tracks on the Oregon Trail
Horizon investigates the environmental protection program going on in the state of Oregon in the USA. Oregon is the first state to clean up it's environment.
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Episode 15 of season 16 of Horizon: “Tracks on the Oregon Trail”. Aired 1979-10-01. Watch it online free on ZapFlix.