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Much about Mr. Blum’s life was shrouded in mystery: He always claimed he was from Warsaw, although many who knew him said he actually came from Chelm, in southeast Poland. Several people close to Mr. Blum said that before World War II, in Poland, he had a wife and child who perished in the Holocaust, though Mr. Blum seems never to have talked of them, and the International Tracing Service in Bad Arolsen, Germany, has no record of them in its database. Even his birth date is in question. Records here give it as Sept. 16, 1914; identity cards from a German displaced persons camp have it as Sept. 15.