Columbia subject headings:
Klages, Ludwig, 1872-1956--Bibliography.
Klages, Ludwig, 1872-1956.
Harvard subject headings:
Klages, Ludwig, 1872-1956--Bibliography.
Klages, Ludwig, 1872-1956.
Princeton subject headings:
Klages, Ludwig, 1872-1956--Bibliography.
Klages, Ludwig, 1872-1956.