Columbia subject headings:
Karlag (Penal colony)
Political prisoners--Soviet Union.
Harvard subject headings:
Concentration camps--Kazakhstan--Qaraghandy oblysy--History.
Forced labor--Soviet Union--History
Karlag (Concentration camp)--History.
Political prisoners--Soviet Union--History.
Prisons--Soviet Union--History.
Soviet Union--History--1925-1953.
Princeton subject headings:
Karlag (Penal colony)
Political prisoners--Soviet Union.