@misc{indiciae6a00c808457b,
  title = {Reconnaissance geologic map and cross sections of central Costa Rica},
  author = {R.D. Krushensky and Enrique V. Malavassi and Rolando M. Castillo},
  year = {1976},
  doi = {10.3133/i899},
  url = {https://pubs.usgs.gov/publication/i899},
  note = {Source identifier: i899}
}