@misc{indiciaec40224ef4f96,
  title = {Spectra of altered rocks in the visible and near infrared},
  author = {G.R. Hunt and Roger P. Ashley},
  year = {1979},
  doi = {10.2113/gsecongeo.74.7.1613},
  url = {https://pubs.usgs.gov/publication/70209766},
  note = {Source identifier: 70209766}
}