@misc{indiciaed173fb8c1f12,
  title = {QDF database system, version 1.0 : reflectance of ore minerals; a search-and-match identification system for IBM and compatible microcomputers using the IMA/COM quantitative data file for ore minerals, second issue, Part E - QDF data file disk},
  author = {Carol N. Gerlitz and B. F. Leonard and A.J. Criddle},
  year = {1989},
  doi = {10.3133/ofr89306e},
  url = {https://pubs.usgs.gov/publication/ofr89306E},
  note = {Source identifier: ofr89306E}
}