Letter from J. E. Butterworth of the United States War Department, confirming that Ernst Berl's (1877-1946) application for the position of Expert Consultant to the War Department has been approved. Butterworth instructs Berl to create an appointment to be sworn in when he visits Washington D.C.
Butterworth, J. E., and United States. War Department. “Letter to Ernst Berl from J. E. Butterworth, April 16, 1943,” April 16, 1943. Ernst Berl Papers, Box 2, Folder 47. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/wjiv3pp.
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