@misc{indiciae51738af4fc86,
  title = {Revision of Primary Series Maps},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1998},
  doi = {10.3133/fs01698},
  url = {https://pubs.usgs.gov/publication/fs01698},
  note = {Source identifier: fs01698}
}