@misc{indiciae073a8baa869a,
  title = {Proceedings of the Workshop on methods and techniques for digitizing cartographic data},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1985},
  doi = {10.3133/ofr85307},
  url = {https://pubs.usgs.gov/publication/ofr85307},
  note = {Source identifier: ofr85307}
}