Columbia subject headings:
Artists--Germany--Correspondence.
Erdmann-Macke, Elisabeth, 1888-1978--Correspondence.
Macke, August, 1887-1914--Correspondence.
Harvard subject headings:
Artists--Germany--Correspondence.
Erdmann-Macke, Elisabeth, 1888-1978--Correspondence.
Macke, August, 1887-1914--Correspondence.
Princeton subject headings:
Artists--Germany--Correspondence.
Erdmann-Macke, Elisabeth, 1888-1978--Correspondence.
Macke, August, 1887-1914--Correspondence.