American Radio Archive

American Radio Archives is located within the Thousand Oaks Library in Thousand Oaks, California and contains one of the largest collections of radio broadcasting in the United States and in the world. The archives was established in 1984 by the Thousand Oaks Library Foundation. The collections include 23,000 radio and TV scripts, 10,000 photographs, 10,000 books on radio history, and 5,000 audio recordings.

Source: Wikipedia