TY - RPRT TI - An acoustical technique for evaluation of thermal insulation AU - Flynn, Daniel R AU - Evans, David J AU - Bartel, Thomas W PY - 1989 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 88-3882 DO - 10.6028/NIST.IR.88-3882 ER -