@misc{indiciaeb58db3dd86bd,
  title = {Determination of quantitative geologic data with stereometer-type instruments},
  author = {William R. Hemphill},
  year = {1958},
  doi = {10.3133/b1043c},
  url = {https://pubs.usgs.gov/publication/b1043C},
  note = {Source identifier: b1043C}
}