Columbia subject headings:
Authors, German--20th century--Biography.
Unruh, Friedrich Franz von, 1893-1986.
Harvard subject headings:
Authors, German--20th century--Biography
Unruh, Friedrich Franz von, 1893---Biography.
Unruh, Friedrich Franz von, 1893-1986.
Princeton subject headings:
Authors, German--20th century--Biography.
Unruh, Friedrich Franz von, 1893-1986.