Columbia subject headings:
Hasidim--Poland--Mszczonów--Biography.
Kalish, Yaakov Dovid, II, 1906-1942--Correspondence.
Rabbis--Poland--Biography.
Rabbis--Poland--Mszczonów--Biography.
Harvard subject headings:
Biographies
Hasidim--Biography
Jacob David, of Amshinov, -1878.
Princeton subject headings: