TY  - RPRT
TI  - ISOPLOT version 2; a plotting and regression program for isotope geochemists, for use with HP series 200/300 computers
AU  - K.R. Ludwig
PY  - 1988
DO  - 10.3133/ofr87601
UR  - https://pubs.usgs.gov/publication/ofr87601
ID  - ofr87601
ER  -