They feature news, public affairs, arts, sports, comedy and variety programs as well as commercial advertising. The collection includes such great radio moments as Franklin D. Roosevelt's “fireside chats” and Don Larsen's perfect game in 1956, as well as television coverage of the first Apollo moon landing, previously thought-to-be-lost episodes of “The Honeymooners,” the first hours of MTV, and the pilot episode of “Seinfeld.” Many of the most significant and entertaining clips from the collection will be offered on the Internet next year.