Columbia subject headings:
Communism--Russia (Federation)--Permskai︠a︡ oblastʹ--History--Chronology.
Kommunisticheskai͡a partii͡a Sovetskogo Soi͡uza--History--Chronology.
Harvard subject headings:
Communism--Russia (Federation)--Permskai︠a︡ oblastʹ--History--Chronology.
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za--History--Chronology.
Princeton subject headings: