@misc{indiciaee7913e379129,
  title = {Geologic data report on the Black Butte hydrofrac hole, western San Bernardino County, California},
  author = {J.E. Springer and G.D. Myren},
  year = {1985},
  doi = {10.3133/ofr85214},
  url = {https://pubs.usgs.gov/publication/ofr85214},
  note = {Source identifier: ofr85214}
}