Columbia subject headings:
Harvard subject headings:
Artists--Germany (West)--Correspondence.
Museum directors--Germany (West)--Correspondence.
Nolde, Emil, 1867-1956--Correspondence.
Osthaus, Karl Ernst, 1874-1921--Correspondence.
Princeton subject headings:
Art historians--Germany--Correspondence.
Artists--Germany--Correspondence.
Nolde, Ada.
Nolde, Emil, 1867-1956.
Osthaus, Gertrud.
Osthaus, Karl Ernst, 1874-1921.