@misc{indiciae501cfd2dd240,
  title = {The determination of 28 elements in whole coal by direct-current arc spectrography},
  author = {J.D. Fletcher and D. W. Golightly},
  year = {1985},
  doi = {10.3133/ofr85204},
  url = {https://pubs.usgs.gov/publication/ofr85204},
  note = {Source identifier: ofr85204}
}