"Hard economic and historical data" with no sources
Can't provide you the exact pages right now, but my sources are:
-Robert C. Allen's "Farm to Factory: a reinterpretation of the Soviet industrial revolution"
-Alec Nove's "An economic history of the Soviet Union"
-Albert Szymanski's "Human Rights in the Soviet Union" and "Is the red flag flying"
-A. Zveriev's "Lo que recibe el trabajador soviético además de su salario"
Not country-wide...