TY - RPRT TI - Institute of Materials Science and Engineering : Nondestructive Evaluation : technical activities 1986 AU - Yolken, H Thomas AU - Mordfin, L PY - 1987 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS IR 86-3434 DO - 10.6028/NBS.IR.86-3434 ER -