Columbia subject headings:
Cossacks--Ukraine--History--17th century.
Slobidska Ukraine (Ukraine and Russia)--Economic conditions.
Slobidska Ukraine (Ukraine and Russia)--History.
Harvard subject headings:
Cossacks--Ukraine--History--17th century.
Slobidska Ukraine (Ukraine and Russia)--Economic conditions.
Slobidska Ukraine (Ukraine and Russia)--History.
Princeton subject headings: