TY - GEN AU - John L Berg C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1976-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.SP.451 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1976 TI - Data base directions ::the next steps ER -