History

Produced by the US Bureau of Mines in 1959. Duration: 8:19

Produced by the US Bureau of Mines in 1959. Duration 6:03.

Produced by the US Bureau of Mines in 1959. Duration 5:40.

Duration 1:56

Duration 2:31

Duration 0:27

Duration 2:59

This is clipped from The Air We Breathe in Industrial Environments, a 16 minute US Bureau of Mines film from 1972. Duration 2:20.

Duration 1:00

Duration 0:38