@misc{indiciaed40bdff27984,
  title = {Geological Survey research 1964},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1964},
  doi = {10.3133/pp501d},
  url = {https://pubs.usgs.gov/publication/pp501D},
  note = {Source identifier: pp501D}
}