Letters, dated April and June 1962, from Leo Beranek of BBN to Abramovitz, Leopold Stokowski and others. Mimeograph copy with handwritten annotations of the first draft of chapter 15, Philharmonic Hall, the Lincoln Center for the Performing Arts, from Beranek's book, Music, Acoustics & Architecture (New York : Wiley, 1962). File also contains BBN's Detailed Plans for the Tuning Period, May 1, 1962. Primarily devoted to acoustics, the file also includes materials on other topics such as Philharmonic seating plans. Included are memoranda, clippings, and transparencies. Original file labeled: M.A. Phil Mscl 1962, 1963-5 and inscribed by MA: MA File* Misc 62/65 Acoustics etc.