Ernst Berl (1877-1946) answers E. W. Gruhn, deputy director of intelligence of the United States War Department, questions regarding his age, citizenship status, and willingness to serve overseas. Berl also writes an overview of his educational background and professional skill set.
Berl, Ernst. “Letter from Ernst Berl to Colonel E. W. Gruhn, September 20, 1943,” September 20, 1943. Ernst Berl Papers, Box 2, Folder 47. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/ye0eg81.
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