Columbia subject headings:
Harvard subject headings:
Chemical engineers--Soviet Union.
Historians--Russia (Federation)
Political prisoners--Soviet Union.
Potapov, Nikolaĭ (Nikolaĭ Vasilʹevich), 1937-2012--Childhood and youth.
Potapov, Nikolaĭ (Nikolaĭ Vasilʹevich), 1937-2012.
Sosnogorsk (Russia)--History--20th century.
Ukhta (Komi, Russia)--History--20th century.
Princeton subject headings:
Chemical engineers--Soviet Union.
Historians--Russia (Federation).
Political prisoners--Soviet Union.
Potapov, Nikolaĭ (Nikolaĭ Vasilʹevich), 1937-2012--Childhood and youth.
Sosnogorsk (Russia)--History--20th century.
Ukhta (Komi, Russia)--History--20th century.