@misc{indiciae0ca2d0d5bc1b,
  title = {Digital line graphs from 1:100,000-scale maps},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1989},
  doi = {10.3133/70046345},
  url = {https://pubs.usgs.gov/publication/70046345},
  note = {Source identifier: 70046345}
}