@misc{indiciae5661b231916c,
  title = {Preliminary pictorial map of Tethys},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1982},
  doi = {10.3133/i1487},
  url = {https://pubs.usgs.gov/publication/i1487},
  note = {Source identifier: i1487}
}