@misc{indiciae7ce73f5d8e1f,
  title = {Respirator usage and effectiveness in bituminous coal mining operations.},
  author = {H E Harris and W C DeSieghardt and W A Burgess and P C Reist},
  year = {1974},
  doi = {10.1080/0002889748507018},
  url = {https://pubmed.ncbi.nlm.nih.gov/4522752/},
  note = {Source identifier: 4522752}
}