This primary source comes from the Records of the Office of the Secretary of the Interior.
National Archives Identifier:
2173183Full Citation: Sound Recording 48.163; Adolf Hitler's Address on the Sudeten Germans; 9/12/1938; Sound Recordings Relating to Conservation, ca. 1939 - 1946; Records of the Office of the Secretary of the Interior, Record Group 48; National Archives at College Park, College Park, MD. [Online Version, https://docsteach.org/documents/document/hitlers-address-sudeten, April 20, 2024]