@misc{indiciaec08b5f2d5332,
  title = {Principal facts for gravity stations in the Geysers-Clear Lake region, California},
  author = {William F. Isherwood and Rodger H. Chapman},
  year = {1975},
  doi = {10.3133/ofr75107},
  url = {https://pubs.usgs.gov/publication/ofr75107},
  note = {Source identifier: ofr75107}
}