Close attention will be paid to newly-available Soviet archival data on economic development.

These are archival data, secondary sources, running records, and recollections.

The archival data, or primary sources, are typically the resources that researchers rely most heavily on.

This includes archival and backup data that would formerly have been saved on tape or other offline storage.

The book is based on published materials and archival data made public.

Some extrapolate on the basis of deaths in a given area, while others use archival data.

"You can't really answer it with archival data."

Also, assessment information, tax records and other archival data are available for public access.

According to a 1993 study of archival Soviet data, a total of 1,053,829 people died in the Gulag from 1934 to 1953.

Soviet archival data for 1930-32 also support that conclusion.