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  1. 1
    by Heyl, Paul Renno, 1872-
    Published 1938
    “...National Bureau of Standards circular ;...”
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    Architectural acoustics /
  2. 2
    by Chrisler, Vivian Leroy, 1885-
    Published 1933
    “...National Bureau of Standards circular ;...”
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    A discussion of some of the principles of acoustical insulation.

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