Columbia subject headings:
Harvard subject headings:
Bulgaria--History--1762-1878.
Levski, Vasil Ivanov, 1837-1873--Trials, litigation, etc.
Revolutionaries--Bulgaria--History.
Trials (Political crimes and offenses)--Bulgaria--Sofia.
Princeton subject headings:
Bulgaria--History--1762-1878.
Levski, Vasil, 1837-1873.
Revolutionaries--Bulgaria--Biography.