@misc{indiciaed683d5051305,
  title = {Geochemical and mineralogical maps for soils of the conterminous United States},
  author = {David B. Smith and William F. Cannon and Laurel G. Woodruff and Federico Solano and Karl J. Ellefsen},
  year = {2014},
  doi = {10.3133/ofr20141082},
  url = {https://pubs.usgs.gov/publication/ofr20141082},
  note = {Source identifier: ofr20141082}
}