Columbia subject headings:
Ginzburg, Evgenii︠a︡--Correspondence.
Internment camps--Soviet Union.
Nazi concentration camps--Soviet Union.
Political prisoners--Soviet Union--Correspondence.
Prisons--Soviet Union.
Harvard subject headings:
Forced labor--Soviet Union--History--Sources.
Glavnoe upravlenie ispravitelʹno-trudovykh lagereĭ OGPU--Records and correspondence.
Internment camp inmates--Soviet Union
Labor camps--Soviet Union--History--Sources.
Political prisoners--Soviet Union--Correspondence
Princeton subject headings:
Ginzburg, Evgenii︠a︡--Correspondence.
Internment camps--Soviet Union.
Political prisoners--Soviet Union--Correspondence.
Prisons--Soviet Union.