@misc{indiciaea0c63ec5ab55,
  title = {Vision-perception testing and training program: clerical operations.},
  author = {H N Walton and D G Schubert},
  year = {1969},
  doi = {10.1097/00006324-196911000-00005},
  url = {https://pubmed.ncbi.nlm.nih.gov/5261150/},
  note = {Source identifier: 5261150}
}