@misc{indiciaec5b67c3a8572,
  title = {Geochemical survey of the western coal regions second annual progress report, July 1975},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1975},
  doi = {10.3133/ofr75436},
  url = {https://pubs.usgs.gov/publication/ofr75436},
  note = {Source identifier: ofr75436}
}