. "No restrictions on access"@en . "2018 March 24" . . "1 digital file, MPEG-4"@en . . . "Oral history interview with Christian Koppenstein"@en . "Ina Navazelskis, on behalf of the United States Holocaust Memorial Museum Oral History Branch, conducted the oral history interview with Christian Koppenstein on March 24, 2018 in Overgaard, AZ."@en . . "No restrictions on use"@en . . "United States Holocaust Memorial Museum"@en . . . . "irn597035" . .