@misc{indiciae15de50263a74,
  title = {Schematic diagrams and parts list for portable telluric current profiler},
  author = {Donald H. Rohret and Roger H. Lescelius and Frank C. Frischknecht},
  year = {1975},
  doi = {10.3133/ofr75641},
  url = {https://pubs.usgs.gov/publication/ofr75641},
  note = {Source identifier: ofr75641}
}