S16·E15 – Tracks on the Oregon Trail
1979-10-01 • 60 min
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.
1979-10-01 • 60 min
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.