@misc{indiciae3ccc257ec8ac,
  title = {GEOPROGRAM; a program for geologic photogrammetry on the Kern DSR analytical plotter; users manual},
  author = {K.S. Dueholm},
  year = {1989},
  doi = {10.3133/ofr89481},
  url = {https://pubs.usgs.gov/publication/ofr89481},
  note = {Source identifier: ofr89481}
}