@misc{indiciae9f0d95820ca1,
  title = {Public review draft: digital cartographic standard for geologic map symbolization (Postscript implementation)},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1999},
  doi = {10.3133/ofr99430},
  url = {https://pubs.usgs.gov/publication/ofr99430},
  note = {Source identifier: ofr99430}
}