In 1962, Selberg lectured at an inaugural science conference at Yeshiva University. His topic was "Recent developments and open problems in the theory of discontinuous groups." The second file below is a partially corrected audio transcript from that talk. It was found on a shelf near Selberg's desk. (The tape was presumably kept by Yeshiva.) File #1 gives background; it would seem from Gelbart's letter that someone other than Selberg made the bulk of the handwritten corrections.