CIRCA 1969 - Mine plans are drawn up, and air-tight seals are put in place underground to limit radon contamination.

Name: Circa 1969 Mine Plans Drawn Air-tight
Uploaded: 2019-01-11T00:00:00.000Z
Duration: 1 min 41 s
Channel: Rick Ray
Description: CIRCA 1969 - Mine plans are drawn up, and air-tight seals are put in place underground to limit radon contamination. Stock Footage Video (100% Royalty-free) 1022222365 | Shutterstock