Columbia subject headings:
Harvard subject headings:
Belgrade Fortress (Belgrade, Serbia)
Rēgas, Velestinlēs, 1757?-1798--Friends and associates.
Rēgas, Velestinlēs, 1757?-1798.
Princeton subject headings:
Belgrade Fortress (Belgrade, Serbia)
Greece--History--1453-1821.
Rēgas, Velestinlēs, 1757?-1798--Friends and associates.
Rēgas, Velestinlēs, 1757?-1798.