Fig. 3.
Photograph taken by a miner in 2012 at a surface coal mine; it shows three miners enveloped in a dust cloud loading drill holes to blast overburden. Reprinted with permission from “Debilitating Lung Disease Among Surface Coal Miners With No Underground Mining Tenure,” by C.N. Halldin, W.R. Reed, et al., 2015, J Occup Environ Med, 57 (1):62–67