Columbia subject headings:
Bulgaria--Economic policy--1944-1989--Congresses.
Bŭlgarska komunisticheska partii︠a︡--Congresses.
Harvard subject headings:
Bulgaria--Economic policy--1944---Congresses.
Bŭlgarska komunisticheska partii︠a︡--Congresses.
Princeton subject headings:
Bulgaria--Economic policy--1944-1989--Congresses.
Bŭlgarska komunisticheska partii︠a︡--Congresses.