@misc{indiciaeecc6d9bfa529,
  title = {Programs in Hewlett-Packard BASIC for storing, retrieving, and plotting rare-earth element data for geochemical studies, using HP-9831/9872 desk top computers and plotters},
  author = {K.R. Ludwig and John S. Stuckless},
  year = {1979},
  doi = {10.3133/ofr79949},
  url = {https://pubs.usgs.gov/publication/ofr79949},
  note = {Source identifier: ofr79949}
}