When did Horizon Season 9 Episode 33 air?
Horizon Season 9 Episode 33 aired on December 28, 1972.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Horizon documents how in Europe, they are using water canals for industrial transport, as an alternative to roads.
Direct answers for episode-level questions and details.
Horizon Season 9 Episode 33 aired on December 28, 1972.
This episode runs for approximately 60 minutes.
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