@misc{indiciae512eb659e159,
  title = {Tests of run-of-mine and briquetted coal in a locomotive boiler},
  author = {Walter T. Ray and Henry Kreisinger},
  year = {1909},
  doi = {10.3133/b412},
  url = {https://pubs.usgs.gov/publication/b412},
  note = {Source identifier: b412}
}