TY - GEN AU - Bowen, R L AU - Cleek, G W C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1971-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.RPT.10580 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1971 TI - A new series of X-ray-opaque reinforcing fillers for composite materials ::progress report ER -