@misc{indiciae63a62ffa6817,
  title = {Geological Survey Research 1966, Chapter A},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1966},
  doi = {10.3133/pp550a},
  url = {https://pubs.usgs.gov/publication/pp550A},
  note = {Source identifier: pp550A}
}