The Hell’s Angels sub-series (1922-1965) contains material related to the development, production, and post-production of The Caddo Company film, Hell’s Angels. Both the silent and sound versions of the film are represented in the materials.

Materials include contracts and lawsuits, correspondence, financial, story development, and production and direction records, editing and special effects, aviation logs, and advertising, as well as musical scores for the silent version composed by Adolph Tandler and the sound version composed by Hugo Riesenfeld. Also included are black-and-white photographic prints and negatives and twenty-four miniature airplane models.