DEC 2 1965, DEC 5 1965; Three scientists seat themselves in a chamber at the end of the Schwartzwald
DEC 2 1965, DEC 5 1965; Three scientists seat themselves in a chamber at the end of the Schwartzwalder Mine north of Golden to test the effect of radon gas. From front to rear are Al Hazle and Dr. John Emerson, radiological health specialists, and Bob Siek, senior industrial hygienist, all with the Colorado health Department. They take off the face masks after the chamber is cleared. At right are air sampling instruments to determine size of dust particles and concentration of radioactive materials.; (Photo By Jack Riddle/The Denver Post via Getty Images)

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161884918
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Denver Post
Date created:
December 02, 1965
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Denver Post
Object name:
DPL_1656956