@misc{indiciae16f8b18a5a17,
  title = {User's Guide to Handlens - A Computer Program that Calculates the Chemistry of Minerals in Mixtures},
  author = {D. D. Eberl},
  year = {2008},
  doi = {10.3133/ofr20081244},
  url = {https://pubs.usgs.gov/publication/ofr20081244},
  note = {Source identifier: ofr20081244}
}