@misc{indiciaecf76dbdf7715,
  title = {Assessment of geochemical variability and a listing of geochemical data for surface soils of the Front Range Urban Corridor, Colorado},
  author = {R. C. Severson and Harry Allison Tourtelot},
  year = {1994},
  doi = {10.3133/ofr94648},
  url = {https://pubs.usgs.gov/publication/ofr94648},
  note = {Source identifier: ofr94648}
}