Columbia subject headings:
Bulgaria--Economic policy--1944-1989.
Bulgaria--Relations--Soviet Union.
Bŭlgarska komunisticheska partii︠a︡--Party work.
Socialist competition.
Soviet Union--Relations--Bulgaria.
Harvard subject headings:
Princeton subject headings:
Bulgaria--Economic policy--1944-1989.
Bulgaria--Relations--Soviet Union.
Bŭlgarska komunisticheska partii︠a︡.
Socialist competition--Bulgaria.
Soviet Union--Relations--Bulgaria.