Engineering license for William H. Cook, Jr., issued by the Washington State Department of Licenses, January 1, 1948. Authorizes Cook to practice as a professional engineer, qualified in aeronautical engineering.
Mechanic's license for William Hough Cook, Jr., issued by the Federal Aviation Administration, March 28, 1980. Certifies Cook as a mechanic and authorizes him to work on airframe powerplants.
Pilot's license for William Hough Cook, Jr., issued by the Federal Aviation Administration, January 29, 1975. Certifies Cook as a private pilot and authorizes him to operate single and multiengine airplanes over land and sea.
Mechanic's license for Clyde Pangborn issued by the Department of Commerce, Aeronautics Branch, July 15, 1933. Certifies that Pangborn is a licensed airplane and engine mechanic.