@misc{indiciaeca932be2eabf,
  title = {Spectrophotometric study of the thorium-morin mixed-color system},
  author = {M. H. Fletcher and R.G. Milkey},
  year = {2002},
  doi = {10.1021/ac60117a014},
  url = {https://pubs.usgs.gov/publication/70010584},
  note = {Source identifier: 70010584}
}