"1 digital file, WAV"@en . "2012 December 21" . . "United States Holocaust Memorial Museum"@en . "No restrictions on use"@en . "Gail Schwartz, on behalf of the United States Holocaust Memorial Museum Oral History Branch, conducted the interview with Hans Ziegler by telephone on December 21, 2012."@en . . . . "No restrictions on access"@en . . . . "irn50208" . . "Oral history interview with Hans Ziegler"@en .