A series of documentaries on industrial change in the U.S.An online collection of early educational public radio content from the National Association of Educational Broadcasters (NAEB).
https://www.unlockingtheairwaves.org/programs/fifty-years-of-growth/
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The electric intensity of a steam-electric generator symbolizes the search for more natural resources. Demand competes with depletion; the country cries for energy, metal, land, water.