@misc{indiciaea961662bb4fd,
  title = {Visual geography},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey and National Geographic Society and U.S. Department of the Interior},
  year = {1991},
  doi = {10.3133/70039480},
  url = {https://pubs.usgs.gov/publication/70039480},
  note = {Source identifier: 70039480}
}