Columbia subject headings:
Harvard subject headings:
Danube Swabians--Hungary--History--20th century.
Danube Swabians--Romania--History--20th century.
Danube Swabians--Yugoslavia--History--20th century.
Martyrs--History--20th century.
Persecution--Hungary--History--20th century.
Persecution--Romania--History--20th century
Persecution--Yugoslavia--History--20th century.
Princeton subject headings:
Danube Swabians--Hungary--History--20th century.
Danube Swabians--Romania--History--20th century.
Danube Swabians--Yugoslavia--History--20th century.
Martyrs--History--20th century.
Persecution--Hungary--History--20th century.
Persecution--Romania--History--20th century.
Persecution--Yugoslavia--History--20th century.