@misc{indiciae28a447ee13d6,
  title = {Economic geology of the Summerfield and Woodsfield quadrangles, Ohio with descriptions of coal and other mineral resources, except oil and gas},
  author = {Daniel Dale Condit},
  year = {1923},
  doi = {10.3133/b720},
  url = {https://pubs.usgs.gov/publication/b720},
  note = {Source identifier: b720}
}