@misc{indiciae1f892a048dc0,
  title = {Photogrammetric calibration of Apollo film cameras},
  author = {W.T. Borgeson and Raymond M. Batson},
  year = {1969},
  doi = {10.3133/ofr6921},
  url = {https://pubs.usgs.gov/publication/ofr6921},
  note = {Source identifier: ofr6921}
}