@misc{indiciaeb82ac34a89c2,
  title = {Ultraviolet absorption and luminescence studies: Progress report for the period from April to December, 1967},
  author = {W. R. Hemphill},
  year = {1968},
  doi = {10.3133/ofr68127},
  url = {https://pubs.usgs.gov/publication/ofr68127},
  note = {Source identifier: ofr68127}
}