Columbia subject headings:
Benjamin, Walter, 1892-1940.
Klee, Paul, 1879-1940. Angelus novus.
Harvard subject headings:
Benjamin, Walter, 1892-1940
Klee, Paul, 1879-1940. Angelus novus
Princeton subject headings:
Benjamin, Walter, 1892-1940.
Klee, Paul, 1879-1940. Angelus novus.