Columbia subject headings:
Christian martyrs--Germany--History--20th century.
Christian martyrs--History.
Christian martyrs--Soviet Union--History.
Martyrdom--Christianity--History of doctrines.
Harvard subject headings:
Christian martyrs--Germany--History--20th century.
Christian martyrs--History.
Christian martyrs--Soviet Union--History.
Martyrdom--Christianity--History of doctrines.
Princeton subject headings: