@misc{indiciaeb231a2f8b00f,
  title = {The determination of phosphorus in rocks containing vanadium},
  author = {R.B. Randolph and F. S. Grimaldi},
  year = {1949},
  doi = {10.3133/tei99},
  url = {https://pubs.usgs.gov/publication/tei99},
  note = {Source identifier: tei99}
}