@misc{indiciae067a12638f2a,
  title = {Geologic map of the Panama Canal and vicinity, Republic of Panama},
  author = {R. H. Stewart and J.L. Stewart and W. P. with collaboration by Woodring},
  year = {1980},
  doi = {10.3133/i1232},
  url = {https://pubs.usgs.gov/publication/i1232},
  note = {Source identifier: i1232}
}