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Occupational exposures to respirable crystalline silica occur in a variety of
industries and occupations because of its extremely common natural occurrence and the wide uses of materials and products that contain it. At least 1.7 million U.S. workers are potentially exposed to respirable crystallin
...
e silica [NIOSH 1991], and many are exposed to concentrations that exceed limits defined by current regulations and standards.
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Introduction to the Core Curriculum on Tuberculosis: What the Clinician Should Know
Center for Disease Control and Prevention
(2013)
Sixth Edition