CFR 30-90.209-2014
矿产资源. 第90部分:对有尘肺病的煤矿工人的强制性卫生标准. 第90.209节:呼吸性粉尘采样;变速器操作员.
Mineral Resources. Part90:Mandatory health standards—coal miners who have evidence of the development of pneumoconiosis. Section90.209:Respirable dust samples; transmission by operator.