@misc{indiciaee6c8f1c0bf07,
  title = {History and evaluation of national-scale geochemical data sets for the United States},
  author = {David B. Smith and Steven M. Smith and John D. Horton},
  year = {2013},
  doi = {10.1016/j.gsf.2012.07.002},
  url = {https://pubs.usgs.gov/publication/70044948},
  note = {Source identifier: 70044948}
}