Columbia subject headings:
Harvard subject headings:
Koch, Eric, 1919-2018--Correspondence.
Personal correspondence.
World War, 1939-1945--Refugees--Canada--Biography.
Princeton subject headings:
Hambourg, Daria--Correspondence.
Koch, Eric, 1919-2018--Correspondence.
Personal correspondence.
World War, 1939-1945--Refugees--Canada--Biography.