@misc{indiciae306c0a33904c,
  title = {Concentrations of selected constituents in surface-water and streambed-sediment samples collected from streams in and near an area of oil and natural-gas development, south-central Texas, 2011-13},
  author = {Stephen P. Opsahl and Cassi L. Crow},
  year = {2014},
  doi = {10.3133/ds836},
  url = {https://pubs.usgs.gov/publication/ds836},
  note = {Source identifier: ds836}
}