Columbia subject headings:
Art, East Asian--Collectors and collecting--Germany.
Art, East Asian--History.
Boerschmann, Ernst, 1873-1949--Correspondence.
Ecke, Gustav--Correspondence.
Grosse, Ernst, 1862-1927--Correspondence.
Kümmel, Otto, 1874-1952--Correspondence.
Harvard subject headings:
Art, East Asian--Collectors and collecting--Germany.
Art, East Asian--History.
Boerschmann, Ernst, 1873-1949--Correspondence.
Ecke, Gustav--Correspondence.
Grosse, Ernst, 1862-1927--Correspondence.
Kümmel, Otto, 1874-1952--Correspondence.
Princeton subject headings:
Art, East Asian--Collectors and collecting--Germany.
Art, East Asian--History.
Boerschmann, Ernst, 1873-1949--Correspondence.
Ecke, Gustav--Correspondence.
Grosse, Ernst, 1862-1927--Correspondence.
Kümmel, Otto--Correspondence.