@misc{indiciaea1fe1d52d9e5,
  title = {Using GIS to evaluate map data},
  author = {Michael E. Madigan and J. A. Sturdevant and C.A. Roberts},
  year = {1988},
  url = {https://pubs.usgs.gov/publication/70186207},
  note = {Source identifier: 70186207}
}