Many of the unpublished materials in the Musical Acoustics Research Library records have been digitized, except for personal correspondence and other miscellaneous documents. This includes materials from the four collections: the Catgut Acoustical Society, the John W. Coltman Collection, the Arthur H. Benade Collection, and the John Backus Collection. Researchers may access the digital copies through links from the description in the online finding aid.
The collection was processed in 2011 by Andrea Castillo. For more information please see Andrea's previous article.