@misc{indiciaeabc958c5977c,
  title = {Computer programs to calculate basal area increment from tree rings},
  author = {R.L. Phipps and M.L. Field},
  year = {1989},
  doi = {10.3133/wri894028},
  url = {https://pubs.usgs.gov/publication/wri894028},
  note = {Source identifier: wri894028}
}