All of the documentation was added to the tape along with the data. In 1994, Barbara Vaughan moved the data from tape to the OPR Unix archive. After examining the data, she determined that in 1930, the internal labels in the data were unique, but did not match the key in the documentation. Using the two years that did have accurately described and unique labels, she attached these variables to the key and then matched the other two years to these variables in order to determine the canton and district. Also, there were some obvious errors in the list of canton and district names, which were corrected from Francine's notes.
Proportions belonging to major language groups and religions are available for all years.
Variables measuring the education level of draftees are available through 1910, as are the proportions living at various altitudes, which was found to be correlated to fertility trends. Most years have comparable variables showing the breakdown of the labor force by sector, and female labor force participation. In most cases, this appears to be because of a redrawing of districts within a canton. This should perhaps make researchers wary of comparing other variables in the affected cantons and years. However, because of other errors in the documentation for 1930, the districts were matched based on the variables that were the same for all four years.