@misc{indiciaefb7cb59cead0,
  title = {Coal mining and COPD.},
  author = {W K Morgan},
  year = {1999},
  doi = {10.1136/thx.54.2.186a},
  url = {https://pubmed.ncbi.nlm.nih.gov/10325930/},
  note = {Source identifier: 10325930}
}