@misc{indiciae8045988430fa,
  title = {A proposal for upgrading the National-Scale Soil Geochemical Database for the United States},
  author = {David B. Smith and Martin B. Goldhaber and Michael A. Wilson and Rebecca Burt},
  year = {2003},
  doi = {10.3133/fs01503},
  url = {https://pubs.usgs.gov/publication/fs01503},
  note = {Source identifier: fs01503}
}