@misc{indiciae96955d3ab913,
  title = {Regional assessment of factors related to herbicides and nitrate in near-surface aquifers of the midcontinent},
  author = {M. R. Burkart and D.W. Kolpin},
  year = {1993},
  url = {https://pubs.usgs.gov/publication/70169048},
  note = {Source identifier: 70169048}
}