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?
Horizon investigates the threat to the Snowdonia National Park in Britain, from mining companies.
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Episode 17 of season 9 of Horizon: “Do You Dig National Parks?”. Aired 1972-05-22. Watch it online free on ZapFlix.