Riegel's correspondence in this series is primarily between different awards administrators and judges. Riegel corresponded with approximately 320 different individauls within this subseries. Correspondents of note include Mrs. Dupont, Turner Catledge, and Sol Taishoff.

Riegel worked with the Office of War Information durring the Second World War. His role was to provide guidance, analysis, and propose various forms of propaganda to use against enemy forces and to persuade potentially friendly neutrals. Items in this subseries are heavily related to these subjects and report on the successes and failures of implemented propaganda.

Items in this series pertain to Riegel's personal correspondence between himself and colleagues, friends, and family. Some material is related to or mentions his work, but the majority of the material is about his or other people's personal lives, opinions, and thoughts around world events.