When did Horizon Season 11 Episode 21 air?
Horizon Season 11 Episode 21 aired on July 22, 1974.
Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 11 · Episode 21
Mines, Minerals and Men
Jul 22, 1974·1h
Horizon explores the technological and economic reasons for the mining revival in Britain.
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Direct answers for episode-level questions and details.
How long is Horizon Season 11 Episode 21?
This episode runs for approximately 60 minutes.
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