Prior UPDATE issues listed below are posted as PDFs (where available).
Spring 2011, Volume 23, Issue 1 (PDF file)
OSHA Polices on Noise Control by Alice Suter, PhD
A Primer on Engineering Noise Controls by Noel W. Hart, Kimberly Riegel, and Robert D. Bruce, CSTI acoustics
Fitness for Duty by Jennifer Tufts, Ph.D., CCC-A, University of Connecticut