@misc{indiciaeed440490f9a3,
  title = {The purchase of coal under Government and commercial specifications on the basis of its heating value, with analyses of coal delivered under Government contracts},
  author = {Dwight T. Randall},
  year = {1908},
  doi = {10.3133/b339},
  url = {https://pubs.usgs.gov/publication/b339},
  note = {Source identifier: b339}
}