@misc{indiciaea930dddac747,
  title = {Nitrogen concentrations near the water table of the Sheyenne Delta aquifer beneath cropland areas, Ransom and Richland Counties, North Dakota},
  author = {T.K. Cowdery and K. Goff},
  year = {1994},
  url = {https://pubs.usgs.gov/publication/70170587},
  note = {Source identifier: 70170587}
}