@misc{indiciaec00af3ed282f,
  title = {Distribution of nitrate in the unsaturated zone, Highland-East Highlands area, San Bernardino County, California},
  author = {John M. Klein and Wesley L. Bradford},
  year = {1980},
  doi = {10.3133/wri8048},
  url = {https://pubs.usgs.gov/publication/wri8048},
  note = {Source identifier: wri8048}
}