Columbia subject headings:
Bulgaria--Antiquities--Abstracts--Periodicals.
Bulgaria--History--Abstracts--Periodicals.
Ethnology--Bulgaria--Abstracts--Periodicals.
Harvard subject headings:
Bulgaria--Antiquities--Abstracts--Periodicals.
Bulgaria--History--Abstracts--Periodicals.
Ethnology--Bulgaria--Abstracts--Periodicals.
Princeton subject headings:
Archaeology--Bulgaria--Abstracts--Periodicals.
Bulgaria--History--Abstracts--Periodicals.
Bulgaria--Imprints--Periodicals.
Ethnology--Bulgaria--Abstracts--Periodicals.
History--Bibliography--Periodicals.
Periodicals.