Columbia subject headings:
Kamenev, Lev Borisovich, 1883-1936.
Zinovyev, Grigory Yevseyevich, 1883-1936.
Harvard subject headings:
Kamenev, Lev Borisovich, 1883-1936.
Zinovyev, Grigory Yevseyevich, 1883-1936.
Princeton subject headings: