@misc{indiciae1b26eea6e64a,
  title = {Coal exploration in Costa Rica : a project assessment},
  author = {Edwin R. Landis and Jean N. Weaver},
  year = {1989},
  doi = {10.3133/ofr89426},
  url = {https://pubs.usgs.gov/publication/ofr89426},
  note = {Source identifier: ofr89426}
}