Columbia subject headings:
Art, German--Oldenburg (Landkreis)--20th century.
Schmidt-Rottluff, Karl, 1884-1976--Catalogs.
Schmidt-Rottluff, Karl, 1884-1976--Correspondence.
Harvard subject headings:
Princeton subject headings:
Schmidt-Rotluff, Karl, 1884-1976--Catalogs.
Schmidt-Rotluff, Karl, 1884-1976--Correspondence.