@misc{indiciae262189a18629,
  title = {Research, Investigations and Technical Developments, National Mapping Program},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1983},
  doi = {10.3133/ofr83568},
  url = {https://pubs.usgs.gov/publication/ofr83568},
  note = {Source identifier: ofr83568}
}