This primary source comes from the National Archives Collection of World War II War Crimes Records.
Full Citation: 238-OMT-XII-E-1; Map of Germany's expansion during WWII; ca. 1946-1949; Tribunal XII [12] – High Command Trial – Evidence; Photographs Relating to the Minor Nuremberg Trials, 1946 - 1949; National Archives Collection of World War II War Crimes Records, Record Group 238; National Archives at College Park, College Park, MD. [Online Version, https://www.docsteach.org/documents/document/map-of-germanys-expansion-during-wwii, April 27, 2024]