@misc{indiciaebf547c3c8efd,
  title = {Trends in groundwater quality in principal aquifers of the United States, 1988-2012},
  author = {Bruce D. Lindsey and Michael G. Rupert},
  year = {2014},
  url = {https://pubs.usgs.gov/publication/70048391},
  note = {Source identifier: 70048391}
}