TY  - RPRT
TI  - A computer program in Hewlett-Packard BASIC for plotting and processing U-Pb isotope data on concordia diagrams
AU  - K.R. Ludwig
PY  - 1979
DO  - 10.3133/ofr791692
UR  - https://pubs.usgs.gov/publication/ofr791692
ID  - ofr791692
ER  -