Columbia subject headings:
Erdmann, Ilse, 1879-1924--Correspondence.
Rilke, Rainer Maria, 1875-1926--Correspondence.
Harvard subject headings:
Erdmann, Ilse, 1879-1924--Correspondence.
Rilke, Rainer Maria, 1875-1926. Correspondence.
Princeton subject headings:
Erdmann, Ilse, 1879-1924--Correspondence.
Rilke, Rainer Maria, 1875-1926. Correspondence.