@misc{indiciaea258e7fd3055,
  title = {The Twinplex: a new stereoplotting instrument},
  author = {Morris Mordecai Thompson},
  year = {1950},
  doi = {10.3133/cir82},
  url = {https://pubs.usgs.gov/publication/cir82},
  note = {Source identifier: cir82}
}