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- Research methods and measures:
- Particulate matter measures
- Document types:
- Information Circulars
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1/1/1986 - Information CircularsThe Bureau of Mines has recorded a number of different background dust sources that significantly contaminate the air breathed by bag machine operators. To keep bag operator exposure within acceptable dust levels established by the Mine Safety and Healt...
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5/1/1967 - Information CircularsA revision of a previous Bureau of Mines publication, this IC provides the history, method of preparation and details regarding the proper use of the Ringlemann Smoke Chart.
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Content source: National Institute for Occupational Safety and Health, Mining Program