Morgan, Willard D, and Henry M. Lester. The Leica Manual: A Manual for the Amateur and Professional Covering the Entire Field of Leica Photography. New York: Morgan & Lester, 1935. Print.
SPC Byrd Williams Exhibit_F16_Artifact Photo-201
The inside front cover of Byrd Williams III's 1935 Leica camera manual is magnified to give a better view of Byrd III's drawing.