Source
Source: Folder: Germany: Security, 1961: August–December. Dates of Materials: 1961: 2 August–11 December, undated. Digital Identifier: JFKPOF-117-007-p0026. John F. Kennedy Presidential Library and Museum. Available online at: https://www.jfklibrary.org/asset-viewer/archives/JFKPOF/117/JFKPOF-117-007?image_identifier=JFKPOF-117-007-p0026