@misc{indiciaeacea4440c06a,
  title = {Texas Instruments Model 59 hand-calculator program to calculate theoretical Wenner and Schlumberger vertical electric soundings over a structure of up to 10 horizontal layers},
  author = {Donald N. Haines and David L. Campbell},
  year = {1980},
  doi = {10.3133/ofr80190},
  url = {https://pubs.usgs.gov/publication/ofr80190},
  note = {Source identifier: ofr80190}
}