From the Wikipedia page 
The American Radio Archive, established in 1984 by the Thousand Oaks Library Foundation, contains manuscripts, sound recordings, scripts, books, photographs and other materials that vividly reflect the history of radio and radio broadcasting. It is located in the Thousand Oaks, California Library and is one of the library's special collections.
The archive is made up of numerous collections, including the Norman Corwin Collection and the Rudy Vallée Collection.
The Norman Corwin Collection currently contains materials selected by Corwin for inclusion during his lifetime: correspondence, scrapbooks, radio and television scripts, motion picture screenplays, sound recordings, video recordings, photographs, business records and contracts, press clippings, and various ephemera. The bulk of accessible materials documents Corwin's career in radio and television broadcasting, motion pictures, the theater, and as an author and teacher, from 1935 to 1990.
The Rudy Vallée Collection constitutes the great majority of personal documents in Vallee's possession at the time of his death, including correspondence, scrapbooks, radio and television scripts, sound recordings, musical scores, photographs, business records, press clippings, and various ephemera. The bulk of accessible materials documents Vallee's career in radio broadcasting and entertainment from 1925-1975.
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