Columbia subject headings:
Gregor, Joseph, 1888-1960.
Strauss, Richard, 1864-1949--Dramaturgy.
Strauss, Richard, 1864-1949. Friedenstag.
Wagner, Richard, 1813-1883--Influence.
Harvard subject headings:
Gregor, Joseph, 1888-1960. Friedenstag.
Strauss, Richard, 1864-1949. Friedenstag.
Princeton subject headings:
Gregor, Joseph, 1888-1960. Friedenstag.
Strauss, Richard, 1864-1949. Friedenstag.