Good thing I did a ‘find’ before starting a new thread. 
This NPR article has the full 14:14 minute film.
It would have been cooler if the beavers were strapped into little harnesses instead of being in boxes. 
What’s not to love about silky, boxed beavers dropping from the sky?
There was also a feature on this wildlife program on the TV show “Mysteries at the Museum”. They had a box that was used to drop the critters, and told the story around that. They seemed to indicate the program was somewhat successful.
That show can be an awful lot of old bullshit sometimes, however.
Human sacrifice! Dogs and cats living together! Mass hysteria! Beavers dropping from the sky! :eek:
The Dam Builders, a story of daring and ingenuity on how the Idaho Fish and Game Department developed a novel technique of rodent bombardment, soon in a theater near you.
Hellfire and Dam Nation!
The hardest part was teaching them to yell “Geronimo!” or “Currahee!” when they were pushed out of the plane.
The glider-borne beavers suffered much higher casualties.
Nice Beaver–Lt Frank Drebin
In hindsight, making the gliders out of wood was a bad idea.
As God is my witness, I thought beavers could fly.
They aren’t fooling me. Those beavers are after my precious bodily fluids…which of course I will continue to steadfastly deny them.