Columbia subject headings:
Zech, Paul, 1881-1946--Criticism and interpretation.
Harvard subject headings:
Zech, Paul, 1881-1946--Criticism and interpretation.
Zech, Paul, 1881-1946--Influence.
Zech, Paul, 1881-1946--Political and social views.
Princeton subject headings:
Zech, Paul, 1881-1946--Criticism and interpretation.