CFR 30-71.205-2014
矿产资源. 第71部分:强制性卫生标准-表面煤矿和地下煤矿地面工作区. 第71.205节:批准的采样设备;操作;空气流量.
Mineral Resources. Part71:Mandatory health standards—surface coal mines and surface work areas of underground coal mines. Section71.205:Approved sampling devices; operation; air flowrate.