Columbia subject headings:
Canada--Foreign relations--United States.
United States--Foreign relations--Canada.
World War, 1939-1945--Economic aspects--Canada.
World War, 1939-1945--Economic aspects--United States.
Harvard subject headings:
Canada--Foreign relations--United States.
United States--Foreign relations--Canada.
World War, 1939-1945--Economic aspects--Canada.
World War, 1939-1945--Economic aspects--United States.
World War, 1939-1945--United States.
Princeton subject headings:
Canada--Foreign relations--United States.
United States--Foreign relations--Canada.
World War, 1939-1945--Economic aspects--Canada.
World War, 1939-1945--Economic aspects--United States.