@misc{indiciaed22801e69a4a,
  title = {Map of Hillsborough County, Florida, showing contours on the piezometric surface in the principal artesian aquifer},
  author = {W.S. Wetterhall},
  year = {1959},
  doi = {10.3133/ofr59127},
  url = {https://pubs.usgs.gov/publication/ofr59127},
  note = {Source identifier: ofr59127}
}