Columbia subject headings:
Authors, Polish--20th century--Biography.
Educators--Poland--Biography.
Holocaust, Jewish (1939-1945)
Jewish authors--Poland--Biography.
Jewish educators--Poland--Biography.
Jews--Poland--Warsaw--Biography.
Korczak, Janusz, 1878-1942.
Harvard subject headings:
Princeton subject headings:
Educators--Poland--Warsaw--Biography.
Jews--Poland--Warsaw--Biography.
Korczak, Janusz, 1878-1942.