@misc{indiciaea9d8fb90752c,
  title = {Earth resources survey program - Ultraviolet absorption and luminescence studies Progress report, Apr. - Dec. 1967},
  author = {Hemphill, W. R.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19690019023},
  note = {Source identifier: 19690019023}
}