@misc{indiciaedc0011cc551c,
  title = {User’s guide for GcClust—An R package for clustering of regional geochemical data},
  author = {Karl J. Ellefsen and David B. Smith},
  year = {2016},
  doi = {10.3133/tm7c13},
  url = {https://pubs.usgs.gov/publication/tm7C13},
  note = {Source identifier: tm7C13}
}