Rescue attempts during the Holocaust : proceedings of the 2nd Yad Vashem International Historical Conference, Jerusalem, April 8-11, 1974 - International Historical Conference; Gutman, Yisrael Herausgeber; Zuroff, Efraim Herausgeber; Arad, Yitzhak Mitwirkender; Yad Vashem (Yad Vashem, 1977)