Letter from Nathan and Johanna Rosenberg and Rosel to Alfred and Alise Rosenberg, October 1938 Box 1, Folder 6 Bookmark Collection Context University of Michigan. Special Collections Research Center Rosenberg Family Correspondence, 1938-2010, bulk 1938-1946
Letter from Nathan Rosenberg to Eugen Rosen, September 28, 1938 Box 1, Folder 5 Bookmark Collection Context University of Michigan. Special Collections Research Center Rosenberg Family Correspondence, 1938-2010, bulk 1938-1946