Columbia subject headings:
Council for Mutual Economic Assistance--Congresses.
Energy development--Europe, Eastern--Congresses.
Energy industries--Europe, Eastern--Congresses.
Harvard subject headings:
Council for Mutual Economic Assistance--Congresses.
Energy development--Europe, Eastern--Congresses.
Energy industries--Europe, Eastern--Congresses.
Princeton subject headings:
Council for Mutual Economic Assistance--Congresses.
Energy development--Europe, Eastern--Congresses.
Energy industries--Europe, Eastern--Congresses.