Columbia subject headings:
Mann, Thomas, 1875-1955--Exhibitions.
Wagner, Richard, 1813-1883--Exhibitions.
Harvard subject headings:
Mann, Thomas, 1875-1955--Diaries.
Mann, Thomas, 1875-1955--Exhibitions.
Wagner, Richard, 1813-1883--Exhibitions.
Wagner, Richard, 1813-1883--Influence.
Princeton subject headings:
Mann, Thomas, 1875-1955--Exhibitions.
Wagner, Richard, 1813-1883--Influence--Exhibitions.