@misc{indiciae051c9369f90f,
  title = {Arizona radiometric ages HyperCard Stack computer file, Part A - User guide},
  author = {Carl A. Carlson and Stephen J. Reynolds},
  year = {1990},
  doi = {10.3133/ofr90704a},
  url = {https://pubs.usgs.gov/publication/ofr90704A},
  note = {Source identifier: ofr90704A}
}