Columbia subject headings:
May, Karl, 1842-1912.
Nietzsche, Friedrich Wilhelm, 1844-1900.
Wagner, Richard, 1813-1883.
Harvard subject headings:
May, Karl, 1842-1912
Nietzsche, Friedrich Wilhelm, 1844-1900
Wagner, Richard, 1813-1883
Princeton subject headings:
May, Karl, 1842-1912.
Nietzsche, Friedrich Wilhelm, 1844-1900.
Wagner, Richard, 1813-1883.