Pamphlet about Learadio aircraft radio equipment, circa 1930s. Contains technical specifications and images of various models of transmitters, receivers, power supplies, and accessories. 41 pages.
Pamphlet issued to incoming students of the Boeing Flying Fortress School, Seattle, Washington, circa 1940s. Contains the following sections: Introduction -- Secrecy -- Material for study -- Study Hall -- Grades -- Badges Airplane in general --…