Columbia subject headings:
Borchardt, Rudolf, 1877-1945.
Harvard subject headings:
Authors, German--20th century--Biography
Borchardt, Rudolf, 1877-1945--Family relationships--Germany.
Borchardt, Rudolf, 1877-1945--Family.
Borchardt, Rudolf, 1877-1945.
Princeton subject headings:
Borchardt, Rudolf, 1877-1945.