Columbia subject headings:
Educators--Poland--Biography.
Jews--Poland--Warsaw--Biography.
Korczak, Janusz, 1878-1942.
Harvard subject headings:
Educators--Poland--Warsaw.
Korczak, Janusz, 1878-1942
Princeton subject headings:
Educators--Poland--Biography.
Jews--Poland--Warsaw--Biography.
Korczak, Janusz, 1878-1942.