@misc{indiciae6c0138e9d907,
  title = {Coal resources of Central America},
  author = {E.R. Landis and J. N. Weaver},
  year = {1987},
  doi = {10.3133/ofr87365},
  url = {https://pubs.usgs.gov/publication/ofr87365},
  note = {Source identifier: ofr87365}
}