There is no other reference to date to the "primary documentation" but the link to the data (they should now be online) which are in the fact sheets.
Helium measurements from groundwater samples. With respect to the helium measurements, no detailed documentation of where these samples were collected is provided beyond referring to Geological and Bioregional Assessment Program (2021a) Fact sheet 12, and Geological and Bioregional Assessment Program (2021b) Regional tracer results from the Cambrian Limestone Aquifer. These are both summary documents. Please provide a reference to the primary documentation.