Columbia subject headings:
Altonaer Museum in Hamburg, Norddeutsches Landesmuseum--Catalogs.
Artists--Germany--Correspondence.
Heckel, Erich, 1883-1970--Correspondence.
Kirchner, Ernst Ludwig, 1880-1938--Catalogs.
Kirchner, Ernst Ludwig, 1880-1938--Correspondence.
Postcards--Germany--Hamburg--Catalogs.
Harvard subject headings:
Altonaer Museum im Hamburg, Norddeutsches Landesmuseum--Catalogs.
Artists--Germany--Correspondence.
Heckel, Erich, 1883-1970--Correspondence.
Kirchner, Ernst Ludwig, 1880-1938--Catalogs.
Kirchner, Ernst Ludwig, 1880-1938--Correspondence.
Postcards--Germany--Hamburg--Catalogs.
Princeton subject headings:
Altonaer Museum in Hamburg, Norddeutsches Landesmuseum--Catalogs.
Artists--Germany--Correspondence.
Heckel, Erich, 1883-1970--Correspondence.
Kirchner, Ernst Ludwig, 1880-1938--Catalogs.
Kirchner, Ernst Ludwig, 1880-1938--Correspondence.
Postcards--Germany (West)--Hamburg--Catalogs.