Letter from Nathan Rosenberg and Julius Rosenberg to Gustav Dreyfuß, March 26, 1942 Box 1, Folder 68 Bookmark Collection Context University of Michigan. Special Collections Research Center Rosenberg Family Correspondence, 1938-2010, bulk 1938-1946
Letter from Nathan Rosenberg to unknown, August 13, 1942 Box 1, Folder 69 Bookmark Collection Context University of Michigan. Special Collections Research Center Rosenberg Family Correspondence, 1938-2010, bulk 1938-1946