The papers of Adolph R. Morgan include evidence of his work with underwater communications, microphones, and noise cancellation of underwater sounds.

One of Morgan's lab notebooks (1954-1960) can be found in Record group 26.

The Audio series contains images related to non-broadcast sound equipment. The series is organized into eleven subseries: Commercial sound equipment, Equipment, Intercom, Loud speakers, Manufacturing sets & records, Meters, Microphones, Phonographs & transcriptions, Record changers, Sound trucks, and Speakers. The series materials date from 1930 to 1977. The Meters subseries are primarily images of audio meters like decibel and acoustic gauges measurements, but it’s possible other types of meters are in this subseries related to broadcasting. Additionally meters appear in other series such as the Radio/TV broadcasting series.

The Harry F. Olson papers include schematics and drawings, a body of articles and patents, and correspondence from Olson’s work in acoustics at various RCA research divisions.

Photographs include, predominantly black and white with a few color, images of loudspeakers, microphones, and the magnetic video tape recording system.

Sound tape reels contain over 40 recordings of 'word lists' presumably used by Olson in his work with the phonetic typewriter.