Columbia subject headings:
Musicians--Correspondence.
Wagner, Richard, 1813-1883.
Harvard subject headings:
Chamberlain, Houston Stewart, 1855-1927--Correspondence.
Musicians--Correspondence
Wagner, Cosima, 1837-1930--Correspondence.
Wagner, Richard, 1813-1883
Princeton subject headings:
Musicians--Correspondence, reminiscences, etc.
Wagner, Richard, 1813-1883.