@misc{indiciae35d354eec97b,
  title = {Data, software and applications for education and research in geology; Virginia},
  author = {R.A. Ambroziak and G.R. Woodwell and C.A. Cook and R.E. Wicks},
  year = {1993},
  doi = {10.3133/ofr93231},
  url = {https://pubs.usgs.gov/publication/ofr93231},
  note = {Source identifier: ofr93231}
}