TY  - RPRT
TI  - Plotting and regression programs for isotope geochemists, for use with HP-86/87 microcomputers
AU  - K.R. Ludwig
PY  - 1983
DO  - 10.3133/ofr83849
UR  - https://pubs.usgs.gov/publication/ofr83849
ID  - ofr83849
ER  -