@misc{indiciae730f839f871e,
  title = {Short wave loop-loop sounder},
  author = {T.P. Grover and D.C. Stewart},
  year = {1990},
  doi = {10.3133/ofr90318},
  url = {https://pubs.usgs.gov/publication/ofr90318},
  note = {Source identifier: ofr90318}
}