Columbia subject headings:
Bulgaria--History--1393-1878--Sources.
Charitable uses, trusts, and foundations--Bulgaria--History--Sources.
Endowments--Bulgaria--History--Sources.
Waqf--Bulgaria--History--Sources.
Harvard subject headings:
Bulgaria--History--1393-1878--Sources.
Charitable uses, trusts, and foundations--Bulgaria--History--Sources.
Endowments--Bulgaria--History--Sources.
Waqf--Bulgaria--History--Sources.
Princeton subject headings:
Bulgaria--History--1393-1878--Sources.
Charitable uses, trusts, and foundations--Bulgaria--History--Sources.
Endowments--Bulgaria--History--Sources.
Waqf--Bulgaria--History--Sources.