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Bibliographical References to Blumenfelds in

History of the Jews of Latvia (Di geshikhte fun di Idn in Letland ) 1561-1923 (HJL)

Blumenfeld Joseph, Rabbi HJL 1561-1923 p. 117
Blumenfeld Moshe, Rabbi HJL 1561-1923 p. 147
Blumenfeld Shimon, Rabbi HJL 1561-1923 p. 146