@misc{indiciaebb667860c8e6,
  title = {Excel Spreadsheet Tools for Analyzing Groundwater Level Records and Displaying Information in ArcMap},
  author = {Fred D. Tillman},
  year = {2009},
  doi = {10.3133/tm4f1},
  url = {https://pubs.usgs.gov/publication/tm4F1},
  note = {Source identifier: tm4F1}
}