Columbia subject headings:
Bulgaria--Historiography.
Bulgaria--History.
Bulgaria--Relations--United States.
Nationalism--Bulgaria.
United States--Relations--Bulgaria.
Harvard subject headings:
Bulgaria--Historiography.
Bulgaria--History.
Bulgaria--Relations--United States.
Nationalism--Bulgaria
United States--Relations--Bulgaria.
Princeton subject headings:
Bulgaria--Historiography.
Bulgaria--History.
Bulgaria--Relations--United States.
Nationalism--Bulgaria.
United States--Relations--Bulgaria.