@misc{indiciaed54abfcbdb89,
  title = {Cost-benefit analysis of the initiative to accelerate the digitizing of 7.5-minute maps},
  author = {S.R. Gillespie},
  year = {1993},
  doi = {10.3133/ofr93351},
  url = {https://pubs.usgs.gov/publication/ofr93351},
  note = {Source identifier: ofr93351}
}