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Freeman, Gordon Dr., personal letter to author dated 3/7/02
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granted to Sten Hellstroem and Rolf Bertil Goeran Joenson,
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Bundersarkiv, Postfach 450569, 12175 Berlin, file on Dr. W.
0. Schumann, courtesy of Mark D. Kneipp.
8.
Foreign Scientists Case Files, 1945-58 "Winfreid Otto
Schumann", Location Box 151,631/26/01/07, The National
Archives, 8601 Adelphi Rd., College Park, Maryland 20740,
Courtesy of Mark Kneipp
9.
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