@misc{indiciae2a6e822ab3b9,
  title = {Test drilling for coal in 1982-83 in the Jefferson National Forest, Virginia; Part 4, Analyses of coal cores from the Valley coal fields},
  author = {Frederick Otto Simon and Kenneth John Englund},
  year = {1983},
  doi = {10.3133/ofr83626},
  url = {https://pubs.usgs.gov/publication/ofr83626},
  note = {Source identifier: ofr83626}
}