Columbia subject headings:
Convict labor--Russia (Federation)--Siberia.
Gold mines and mining--Russia (Federation)--Siberia.
Penal colonies--Russia.
Harvard subject headings:
Convict labor--Russia (Federation)--Siberia.
Gold mines and mining--Russia (Federation)--Siberia.
Penal colonies, Russian.
Princeton subject headings:
Convict labor--Russia (Federation)--Siberia.
Gold mines and mining--Russia--Siberia.
Penal colonies, Russian.