Columbia subject headings:
Gibson, Hugh, 1883-1954.
Jews--Poland--History--20th century.
Poland--Ethnic relations.
Poland--Foreign relations--United States.
United States--Foreign relations--Poland.
Harvard subject headings:
Princeton subject headings:
Gibson, Hugh, 1883-1954.
Jews--Poland--History--20th century.
Poland--Ethnic relations.
Poland--Foreign relations--United States.
United States--Foreign relations--Poland.