Columbia subject headings:
Dobruja (Romania and Bulgaria)--Economic conditions--Congresses.
Dobruja (Romania and Bulgaria)--Politics and government--Congresses.
Dobruja (Romania and Bulgaria)--Social conditions--Congresses.
European Union--Dobruja (Romania and Bulgaria)
Harvard subject headings:
Dobruja (Romania and Bulgaria)--Economic conditions--Congresses.
Dobruja (Romania and Bulgaria)--Politics and government--Congresses.
Dobruja (Romania and Bulgaria)--Social conditions--Congresses.
Ecology--Dobruja (Romania and Bulgaria)--Congresses.
European Union--Dobruja (Romania and Bulgaria)--Congresses.
Princeton subject headings:
Dobruja (Romania and Bulgaria)--Economic conditions--Congresses.
Dobruja (Romania and Bulgaria)--Politics and government--Congresses.
Dobruja (Romania and Bulgaria)--Social conditions--Congresses.
Ecology--Dobruja (Romania and Bulgaria)--Congresses.
European Union--Dobruja (Romania and Bulgaria)--Congresses.