@misc{indiciae089832538fb4,
  title = {Ground-water levels, flow, and quality in northwestern Elkhart County, Indiana, 1980-89},
  author = {R.F. Duwelius and C.A. Silcox},
  year = {1991},
  doi = {10.3133/wri914053},
  url = {https://pubs.usgs.gov/publication/wri914053},
  note = {Source identifier: wri914053}
}