@misc{indiciaebe9cee7b353b,
  title = {Index to the reflectance and microindentation hardness of ore minerals in the IMA/COM Quantitative Data File (first issue, 1977)},
  author = {B. F. Leonard},
  year = {1979},
  doi = {10.3133/ofr79658},
  url = {https://pubs.usgs.gov/publication/ofr79658},
  note = {Source identifier: ofr79658}
}