TY - GEN AU - G Birnbaum AU - D G Eitzen C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1979-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.79-1907 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1979 TI - an appraisal of current and future needs in ultrasonic NDE standards: ER -