TY  - RPRT
TI  - Computer programs to calculate basal area increment from tree rings
AU  - R.L. Phipps
AU  - M.L. Field
PY  - 1989
DO  - 10.3133/wri894028
UR  - https://pubs.usgs.gov/publication/wri894028
ID  - wri894028
ER  -