@misc{indiciae1baac09265e5,
  title = {U.S. Geological Survey National Center, Reston, Virginia},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1972},
  doi = {10.3133/70039552},
  url = {https://pubs.usgs.gov/publication/70039552},
  note = {Source identifier: 70039552}
}