Pencil and marker on paper, 24 by 18 inches, signed "Bernhard R. Tessmann" lower right. Additional notation to upper left in pen: "Sketch looks from Northside of Slate-Pit-Rim toward South-rim. No Scale." Some scattered minor creasing. 

Bernhard Tessmann was a German expert in guided missiles during World War II, and was later transferred to the United States as part of Operation Paperclip alongside fellow rocket scientist Wernher von Braun. Tessman played an important role in the development of early U.S. military rockets at Redstone Arsenal in Huntsville, Alabama. The V-2 rocket was developed during WWII in Germany, and was the world's first long-range guided ballistic missile, as well as the first man-made object to travel into space in 1944. Tessmann played a pivotal role in the protection of the V-2 legacy at the end of the war, hiding documents and blueprints pertaining to the V-2 from the SS at the instruction of von Braun.