Columbia subject headings:
Bulgaria--History--1393-1762--Sources.
Bulgarians--Romania--Transylvania--History--18th century--Sources.
Merchants--Romania--Transylvania--History--Sources.
Harvard subject headings:
Bulgarians--Romania--Transylvania--History--18th century.
Merchants--Romania--Transylvania--History--18th century.
Transylvania (Romania)--Commerce.
Transylvania (Romania)--Social life and customs.
Princeton subject headings: