@misc{indiciae616c012235f3,
  title = {Coal in Costa Rica; a progress report, 1981},
  author = {E.R. Landis and R. L. Miller},
  year = {1985},
  doi = {10.3133/ofr85369},
  url = {https://pubs.usgs.gov/publication/ofr85369},
  note = {Source identifier: ofr85369}
}