Columbia subject headings:
Artists--Germany--Correspondence.
Drawing, German--20th century.
Michels, Hermann, 1903---Correspondence.
Russia (Federation)--In art.
World War, 1939-1945--Art and the war.
World War, 1939-1945--Campaigns--Russia (Federation)
Harvard subject headings:
Artists--Germany--Correspondence.
Drawing, German.
Drawing--20th century--Germany.
Michels, Hermann, 1903---Correspondence.
Russia (Federation)--In art.
World War, 1939-1945--Art and the war
World War, 1939-1945--Campaigns--Russia (Federation)
Princeton subject headings: