TY  - RPRT
TI  - ISOPLOT200; a plotting and regression program for isotope geochemists, for use with HP Series 200 computers
AU  - K.R. Ludwig
PY  - 1985
DO  - 10.3133/ofr85513
UR  - https://pubs.usgs.gov/publication/ofr85513
ID  - ofr85513
ER  -