@misc{indiciae6816d9f1571c,
  title = {Principal facts and base station descriptions for gravity data compiled for the Santa Ana 1 degree by 2 degrees quadrangle, California},
  author = {R. F. Sikora and V.E. Langenheim and Shawn Biehler and L. A. Beyer and R. H. Chapman},
  year = {1993},
  doi = {10.3133/ofr93217b},
  url = {https://pubs.usgs.gov/publication/ofr93217B},
  note = {Source identifier: ofr93217B}
}