TY - GEN AU - Dickson, George C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1969-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.RPT.10177 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1969 TI - Ultrasonic methods for determination of mechanical properties of dental materials ::progress report ER -