When did Horizon Season 9 Episode 17 air?
Horizon Season 9 Episode 17 aired on May 22, 1972.
Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 9 · Episode 17
Do You Dig National Parks?
May 22, 1972·1h
Horizon investigates the threat to the Snowdonia National Park in Britain, from mining companies.
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Direct answers for episode-level questions and details.
How long is Horizon Season 9 Episode 17?
This episode runs for approximately 60 minutes.
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