TY  - RPRT
TI  - Pulse-echo ultrasonic evaluation of the integrity of seams of single-ply roofing membranes: laboratory evaluation of a prototype test apparatus
AU  - Watanabe, Hiroshi
AU  - Rossiter, Walter J Jr
PY  - 1990
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NIST IR 4424
DO  - 10.6028/NIST.IR.4424
ER  -