TY  - RPRT
TI  - Programs for filing and plotting U-Pb isotope data for concordia diagrams, using an HP-9830 computer and HP-9862 plotter
AU  - K.R. Ludwig
PY  - 1982
DO  - 10.3133/ofr82386
UR  - https://pubs.usgs.gov/publication/ofr82386
ID  - ofr82386
ER  -