@misc{indiciaec2b06be1ab19,
  title = {JOINT DEVELOPMENT OF A NATIONAL 1:100,000-SCALE DIGITAL CARTOGRAPHIC DATA BASE.},
  author = {George M. Callahan and Frederick R. Broome},
  year = {1984},
  url = {https://pubs.usgs.gov/publication/70014068},
  note = {Source identifier: 70014068}
}