Columbia subject headings:
Pfitzner, Hans, 1869-1949--Congresses.
Pfitzner, Hans, 1869-1949. Herz--Congresses.
Harvard subject headings:
Pfitzner, Hans Erich, 1869-1949--Congresses.
Pfitzner, Hans Erich, 1869-1949. Herz--Congresses.
Pfitzner, Hans, 1869-1949--Congresses.
Pfitzner, Hans, 1869-1949. Herz--Congresses.
Princeton subject headings:
Pfitzner, Hans, 1869-1949.
Pfitzner, Hans, 1869-1949. Herz.