@misc{indiciaea2be59c0620e,
  title = {National Cartographic Information Center Newsletter No. 6},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1977},
  doi = {10.3133/70039592},
  url = {https://pubs.usgs.gov/publication/70039592},
  note = {Source identifier: 70039592}
}