When did Horizon Season 16 Episode 21 air?
Horizon Season 16 Episode 21 aired on November 12, 1979.
Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 16 · Episode 21
A Treasury of Trees
Nov 12, 1979·1h
Horizon investigates how the British landscape is changing its appearance with native trees being replaced by imported species.
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How long is Horizon Season 16 Episode 21?
This episode runs for approximately 60 minutes.
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