@misc{indiciaebeef2e008516,
  title = {Geochemistry of soils from the San Rafael Valley, Santa Cruz County, Arizona},
  author = {Helen W. Folger and Floyd Gray},
  year = {2013},
  doi = {10.3133/ofr20131149},
  url = {https://pubs.usgs.gov/publication/ofr20131149},
  note = {Source identifier: ofr20131149}
}