File:NIOSH-2011-10+.jpg

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Русский: Рисунок 10 из обзора профзаболеваний шахтёров Coal Mine Dust Exposures and Associated Health Outcomes. Сколько часов проработали под землёй шахтёры в США. Заметен рост с 1800 до 2400 за период 1978-2008г. Источник (http://www.msha.gov/ACCINJ/BOTHCL.HTM).
English: Figure 10. Hours worked per underground coal miner, 1978–2008. (Source: http://www.msha.gov/ACCINJ/BOTHCL.HTM).
Date
Source Coal Mine Dust Exposures and Associated Health Outcomes. A Review of Information Published Since 1995
Author Michael Attfield et al (NIOSH, USA)

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This image is a work of the National Institute for Occupational Safety and Health, part of the Centers for Disease Control and Prevention in the United States Department of Health and Human Services, taken or made as part of an employee's official duties. As a work of the U.S. federal government, the image is in the public domain.

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