@misc{indiciae2869488cd058,
  title = {Schlumberger electric soundings in and near Gettysburg Basin, Pennsylvania},
  author = {David L. Campbell},
  year = {1976},
  doi = {10.3133/ofr76773},
  url = {https://pubs.usgs.gov/publication/ofr76773},
  note = {Source identifier: ofr76773}
}