@misc{indiciae6d0da89ec982,
  title = {User documentation for North Dakota geochemical data-base software system; input, update, and retrieval procedures},
  author = {John W. Atwood},
  year = {1993},
  doi = {10.3133/ofr93117},
  url = {https://pubs.usgs.gov/publication/ofr93117},
  note = {Source identifier: ofr93117}
}