@misc{indiciae918281b8f7ce,
  title = {Twin low-oblique photography and the twinplex plotter},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1952},
  doi = {10.3133/cir222},
  url = {https://pubs.usgs.gov/publication/cir222},
  note = {Source identifier: cir222}
}