@misc{indiciaeb72e53cfae26,
  title = {The use of soil-gas helium concentrations for earthquake prediction: Studies of factors causing diurnal variation},
  author = {G. Michael Reimer},
  year = {1979},
  doi = {10.3133/ofr791623},
  url = {https://pubs.usgs.gov/publication/ofr791623},
  note = {Source identifier: ofr791623}
}