Columbia subject headings:
Authors, Yiddish--Biography.
Jewish authors--Poland--Warsaw--Biography.
Jewish educators--Poland--20th century--Biography.
Katzenelson, Itzhak, 1886-1944.
Harvard subject headings:
Authors, Hebrew--Biography.
Authors, Yiddish--Biography
Jewish educators--Poland--20th century.
Katzenelson, Itzhak, 1886-1944
Princeton subject headings:
Authors, Yiddish--Biography.
Jewish authors--Poland--Warsaw--Biography.
Jewish educators--Poland--20th century--Biography.
Katzenelson, Itzhak, 1886-1944.