This primary source comes from the Collection HST-OFF: Official Files (Truman Administration), 1945 - 1953.
Full Citation: Letter from Senator Sheridan Downey to John Steelman with Attached Note; 8/25/1949 - 8/29/1949; Mexican Agricultural Workers, OF 407d; Official Files , 1945 - 1953; Collection HST-OFF: Official Files (Truman Administration), 1945 - 1953; Harry S. Truman Library, Independence, MO. [Online Version, https://www.docsteach.org/documents/document/senator-downey-steelman, April 26, 2024]