@misc{indiciaed360d32d0929,
  title = {Introduction to the U.S. Geological Survey National Water-Quality Assessment (NAWQA) of ground-water quality trends and comparison to other national programs},
  author = {Michael R. Rosen and W.W. Lapham},
  year = {2008},
  doi = {10.2134/jeq2008.0049},
  url = {https://pubs.usgs.gov/publication/70009719},
  note = {Source identifier: 70009719}
}