Acoustics of auditoriums, by F. R. Watson                              70013
  [Subtitle: University of Illinois Bulletin, Vol. XI, March 16, 1914, No. 29]
  [Author: F. R. Watson]
  [Link: https://www.gutenberg.org/7/0/0/1/70013]
  [Files: 70013-0.txt; 70013-h.htm]

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Regards,
Jacqueline