@misc{indiciae0cf896ea53ed,
  title = {Exploring maps},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1993},
  doi = {10.3133/70043847},
  url = {https://pubs.usgs.gov/publication/70043847},
  note = {Source identifier: 70043847}
}