@misc{indiciae68855047b4b0,
  title = {Research, investigations, and technical developments, National Mapping Program, 1981},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1981},
  doi = {10.3133/ofr82236},
  url = {https://pubs.usgs.gov/publication/ofr82236},
  note = {Source identifier: ofr82236}
}