Letters and postcards, mainly from the Holocaust period

Letters and postcards, mainly from the Holocaust period - Censored correspondence from France, Czechoslovakia, Poland and the United States; - Envelope from a letter sent from Germany to Eretz Israel attesting to the existence of a rabbinical seminary in Berlin, in Nazi Germany, in 1936; - Postcard sent from Krakow to Bucharest; written with invisible ink (in code).