@misc{indiciae5d2b99da8fcf,
  title = {Principal facts and base station descriptions for gravity data compiled for the Santa Ana 1 degree by 2 degrees quadrangle, California},
  author = {Robert Sikora and V.E. Langenheim and Shawn Biehler and L. A. Beyer and R. H. Chapman},
  year = {1993},
  doi = {10.3133/ofr93217},
  url = {https://pubs.usgs.gov/publication/ofr93217},
  note = {Source identifier: ofr93217}
}