TY - RPRT TI - Nondestructive Evaluation -- technical activities - 1988 AU - Yolken, H Thomas AU - Mordfin, Leonard PY - 1988 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NIST IR 88-3839 DO - 10.6028/NIST.IR.88-3839 ER -