@misc{indiciae4a4a64fab840,
  title = {Geochemical and mineralogical maps, with interpretation, for soils of the conterminous United States},
  author = {David B. Smith and Federico Solano and Laurel G. Woodruff and William F. Cannon and Karl J. Ellefsen},
  year = {2019},
  doi = {10.3133/sir20175118},
  url = {https://pubs.usgs.gov/publication/sir20175118},
  note = {Source identifier: sir20175118}
}