@misc{indiciae5df0876d033c,
  title = {Frac sand in the United States: a geological and industry overview},
  author = {Mary Ellen Benson and Anna B. Wilson and Donald I. Bleiwas},
  year = {2015},
  doi = {10.3133/ofr20151107},
  url = {https://pubs.usgs.gov/publication/ofr20151107},
  note = {Source identifier: ofr20151107}
}